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South Platte: Greeley to Balzac

Division 1 · Water District 1 · As of 2026-08-26 10:51 MDT

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Reconstruct conditions as of

Evolution of the network

Gage flow trend & changepoints

What counts as a trend here

Computed 2026-08-20 08:16 from 51 gage(s) with cached period-of-record data. Mann-Kendall (trend) and Pettitt (changepoint) both require at least 8 years spanning at least 10 years of record. A gage below that reports no signal — which is not the same as “no change.”

Of the 51 gages with enough record, 3 are trending down and 3 up, and 4 carry a detected shift. The clearest is FORT MORGAN CANAL NEAR WIGGINS, CO, -42.2 points of its long-term median per decade over 34 years (p=0.0017). The other 45 show no clear signal either way.

Gage	Trend	Change / decade points of median	Significance	Years	Changepoint
▸ TREMONT DITCH TRMDITCO	↓ decreasing	-325.5	p=0.028	18	—
▸ BIJOU CANAL BIJOUSCO	↑ increasing	+230.1	p=0.002	30	~2013
▸ FORT MORGAN CANAL NEAR WIGGINS, CO MORCANCO	↓ decreasing	-42.2	p=0.002	34	~2014
▸ WELDON VALLEY DITCH RETURN WELRETCO	↓ decreasing	-33.9	p=0.003	19	~2015
▸ ILLINOIS DITCH ILLDITCO	↑ increasing	+21.7	p=0.016	14	—
▸ SOUTH PLATTE RIVER NEAR KERSEY, CO PLAKERCO	↑ increasing	+4.0	p=0.026	124	~1968

45 other gage(s) show no significant trend or changepoint (not shown).

How the measurement network itself changed

This basin was not always measured the way it is today — the API-era record is dense and recent, the early record sparse. 37 gage(s) and 450 structure(s) report in 2026, but structure reporting only reached half its modern level around ~2009. Every historical claim below is checked against this: long-term shifts that co-move with the growth of the network carry an explicit measurement-evolution caution, and abandonment screens whose idleness begins before the modern reporting era are flagged †.

Decade	Gages with data (median yr)	Structures reporting (median yr)
1900s	1	0
1910s	1	0
1920s	1	0
1930s	2	0
1940s	3	0
1950s	7	12
1960s	6	12
1970s	2	22
1980s	4	52
1990s	8	88
2000s	11	114
2010s	21	396
2020s	35	432

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 6% of 5372 schematic-relevant structures. 0 year(s) clear the 30% coverage gate so far -- the trend activates automatically once qualifying years span a full decade. No action needed; the nightly backfill keeps extending the record.

Reach gain/loss shifts (1950–2026)

Mass-balance kinks computed for every summer month back to 1950 (2347 reach-snapshots) — which reaches gain or lose water, and how that has shifted across decades. Each shift is cross-checked against the observation record above: as more diversions became metered, "unaccounted" water shrinks mechanically, which can masquerade as a hydrologic shift.

ILLINOIS DITCH: reach shifted from -1474 cfs to -513 cfs summer mean (more gaining, p=0.008, 16 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [19 alluvial wells within 2 mi of the gage; pooled water table +0.1 ft (1966–2026, no_trend)]
RIVERSIDE CANAL AT RESERVOIR INLET GAGE: reach shifted from -795 cfs to -10 cfs summer mean (more gaining, p=0.001, 40 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.52) -- part of it may be unaccounted water becoming accounted, not hydrologic change]
SOUTH PLATTE RIVER NEAR WELDONA, CO: reach shifted from -247 cfs to +530 cfs summer mean (more gaining, p=0.000, 74 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.7) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [28 alluvial wells within 2 mi of the gage; pooled water table -3.3 ft (1949–2025, no_trend)]
SOUTH PLATTE RIVER AT FORT MORGAN, CO: reach shifted from -98 cfs to +620 cfs summer mean (more gaining, p=0.000, 39 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.69) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [17 alluvial wells within 2 mi of the gage; pooled water table +0.8 ft (1962–2025, increasing)]
SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR BALZAC: reach shifted from -455 cfs to +153 cfs summer mean (more gaining, p=0.002, 39 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.58) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [26 alluvial wells within 2 mi of the gage; pooled water table +0.2 ft (1966–2025, no_trend)]
JACKSON LAKE OUTLET NEAR FORT MORGAN: reach shifted from -60 cfs to +35 cfs summer mean (more gaining, p=0.027, 25 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [28 alluvial wells within 2 mi of the gage; pooled water table +0.1 ft (1962–2025, no_trend)]

Groundwater now has its own tab: 6806 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 38 reservoir(s), end-of-year storage back to 1950, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 39-year window with full coverage (1988–2026), the dominant shared pattern across 3 gage(s) explains 97% of year-to-year variance (almost certainly a basin-wide climate/snowpack driver).

All gages in this window move with the shared pattern -- no localized outlier.

Structures most implicated by reconciliation (as of 2026-08-12)

Which structures' data absorbed the most correction when the current mass-balance snapshot was reconciled -- see the Historical tab for the full picture on any date.

WELDON VALLEY FT MORGAN FARMS RETURN (return): +195.6 cfs (100% of that reach's correction)
FT MORGAN WESTERN SUGAR RT (return): +159.6 cfs (100% of that reach's correction)
BIJOU OWW PUTNAM RT (return): +144.3 cfs (100% of that reach's correction)
WIGGINS TOWN RO PLANT RETURN TO RIVER (return): -72.1 cfs (50% of that reach's correction)
TIMBRO RANCH AUG RETURN FLOW IMPACT REAC (return): -72.1 cfs (50% of that reach's correction)
WELDON VALLEY DITCH RT (return): +39.7 cfs (50% of that reach's correction)
WELDON VALLEY CNL FRICO/ECCV RETURN (return): +39.7 cfs (50% of that reach's correction)
LOWER LATHAM RT TO BOX ELDER CREEK (return): +13.3 cfs (100% of that reach's correction)

Data provenance & quality

Where these numbers come from and how far they can be trusted. Grade D (2/6 points) — the components below are the finding; the letter alone is not. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (imported 2026-08-19) for history, plus the CDSS REST API for current conditions.

Check	State	What was measured
gage freshness	stale	newest gage reading is 8 day(s) old (target 7)
diversion record	stale	newest diversion record is 658 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	sparse	6% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 492,988 stored values re-checked against DWR's authoritative record (HydroBase_CO_20260707), over 20 structures. 0 disagreement(s) beyond a 0.01 cfs tolerance. Checked 2026-08-19; a rotating sample covers the whole basin across successive runs, and the structures this report cites are checked every time.

Federal cross-check: PASS — 99.95% day-level agreement with USGS's own published records for the same gages, across 17 co-listed station(s) and 114,052 overlapping days (within max(2%, 0.5 cfs) daily). Pre-1950 records at some gages carry known between-agency day-stamp and transcription differences — scored at each year's best ±1-day alignment; residual disagreement is real historical divergence, flagged for review.

51 gage(s) / 347,043 daily values (1901-05-01–2026-08-12); 762 structure(s) with diversion records; 7705 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

235,474 water-level measurements across 6806 monitored well(s) — 1961 alluvial, 3490 bedrock — plus 151 administered well(s) reporting metered pumping.

What is being counted

Observation wells and pumping wells are different populations and are never conflated: water levels come from monitored observation wells, and metered pumping comes from administered wells reporting through diversion records. Click any well to chart its own record.

Well map

3D aquifer x-ray

Every aquifer unit as its own head surface, animated through time.

How the surfaces are built, and what they are not

Alluvial water table on top, Denver Basin members (Dawson, Denver, Arapahoe, Laramie–Fox Hills) stacked beneath where measured, interpolated from measured water levels. Units are never mixed; a surface exists only inside its own unit's well coverage, with no extrapolation; thin epochs are suppressed and say why. Vertical scale is exaggerated for readability and z is head elevation in feet. These are measured heads, not a calibrated groundwater model.

Water-table trends

Of 437 well(s) with enough record for a trend test: 188 declining, 77 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ DB-100 BENNETT WELL #8	bedrock	-124.92	33 yr	0.0
▸ DB-123 ELIZABETH KA-1	bedrock	-80.0	30 yr	0.0175
▸ DB-003 5 M RANCH	bedrock	-41.66	54 yr	0.0
▸ LAND, L.	bedrock	-39.35	41 yr	0.0
▸ SHELTON, E.	bedrock	-31.27	43 yr	0.0
▸ DB-036 SLINGERLAND, TABATHA	bedrock	-23.51	52 yr	0.0
▸ SC00806513DC LDAW 12	unknown	-23.21	33 yr	0.0049
▸ SC00806417BBC DAWMAS21	unknown	-17.83	21 yr	0.0018

Stream corridors — the surface connection

Where a reach's gain or loss has shifted, the wells within two miles of its anchoring gage and what their water table did over the same era.

How the corridor is assembled

For each reach whose gain/loss has shifted (Trends tab): the wells within 2 miles of its anchoring gage, their pooled water-table history over the same era, and an advisory Glover screen of lagged stream depletion from nearby metered pumping. v1 proximity = distance to the reach's anchoring gage; segment-based reach join is a flagged upgrade.

ILLINOIS DITCH: 19 alluvial well(s) nearby; pooled water table +0.1 ft (1966–2026, no_trend, p=0.919). Glover screen: 1.3 cfs of nearby metered alluvial pumping → est. lagged depletion 0.7–1.2 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

RIVERSIDE CANAL AT RESERVOIR INLET GAGE: 1 alluvial well(s) nearby

SOUTH PLATTE RIVER NEAR WELDONA, CO: 28 alluvial well(s) nearby; pooled water table -3.3 ft (1949–2025, no_trend, p=0.2798)

SOUTH PLATTE RIVER AT FORT MORGAN, CO: 17 alluvial well(s) nearby; pooled water table +0.8 ft (1962–2025, increasing, p=0.0112). Glover screen: 1.1 cfs of nearby metered alluvial pumping → est. lagged depletion 0.9–1.1 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR BALZAC: 26 alluvial well(s) nearby; pooled water table +0.2 ft (1966–2025, no_trend, p=0.7125). Glover screen: 2.1 cfs of nearby metered alluvial pumping → est. lagged depletion 1.6–2.0 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

JACKSON LAKE OUTLET NEAR FORT MORGAN: 28 alluvial well(s) nearby; pooled water table +0.1 ft (1962–2025, no_trend, p=0.4044). Glover screen: 0.4 cfs of nearby metered alluvial pumping → est. lagged depletion 0.2–0.4 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

FORT MORGAN CANAL NEAR WIGGINS, CO: 18 alluvial well(s) nearby; pooled water table +0.2 ft (1966–2025, increasing, p=0.0139). Glover screen: 1.3 cfs of nearby metered alluvial pumping → est. lagged depletion 0.8–1.2 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

SOUTH PLATTE RIVER AT MASTERS, CO.: 26 alluvial well(s) nearby; pooled water table +1.6 ft (1947–2025, no_trend, p=0.1011). Glover screen: 3.1 cfs of nearby metered alluvial pumping → est. lagged depletion 2.1–2.9 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

Wells labeled by administrative world before anything else is said about them: tributary alluvium participates in the priority system; designated-basin and Denver Basin bedrock aquifers are governed differently and are excluded from stream-connection reasoning. Read bedrock declines differently too: deep bedrock aquifers recharge negligibly on human timescales, so a falling bedrock level is storage mining — effectively permanent — not a drought response that a wet year undoes. All screens advisory.

38 reservoir(s) with 64,464 storage measurement(s), 1950–2025. Basin storage as of 2024-10-31 (the record's own end — reservoir records publish ~annually): 45,000 AF across 14 reservoir(s).

Why storage matters to the flow network

Storage change is real water the mass balance must credit — a losing reach beside a filling reservoir isn't losing water, it's banking it.

Reservoir map — how full is each vessel?

What “full” is measured against

Bubble size is proportional to a reservoir's record-high storage. Fill is its last recorded storage as a share of its surveyed capacity (USACE National Inventory of Dams) where a confident NID match exists — the tooltip names the matched dam — and as a share of its own record high otherwise. A wrong capacity would be worse than an honest record high, so only confident joins upgrade.

A dashed teal ring marks reservoirs reporting live DWR telemetry: their fill reflects yesterday's storage, is drawn as a dotted tail on charts, and is treated as provisional until the next verified HydroBase snapshot supersedes it.

Basin storage, end of each water year

End-of-water-year totals; per-year reservoir counts shown because reporting coverage varies -- a total is only comparable to years with similar counts.

Largest reservoirs on record

Click a reservoir to chart its full storage history.

Reservoir	Last recorded storage (AF)	As of
▸ RIVERSIDE RES (0103651)	12,708	2024-10-31
▸ JACKSON LAKE RES (0103817)	11,970	2024-10-31
▸ MACARTHY RES (0103572)	8,674	1990-10-31
▸ 70 RANCH STORAGE RESERVOIR (0103028)	4,612	2024-10-31
▸ DUPE WDID, SEE 6403552 (0103552)	4,230	2006-10-31
▸ CORNISH PLAINS RES (0103009)	2,822	2024-10-31
▸ VANCIL RES (0103400)	2,803	2024-10-31
▸ OLDS RESERVOIR (0103845)	2,792	1994-04-13

Decreed rights on this network run from 1860-12-31 to 2024-12-20. 17 abandonment screens and 105 compliance flags are listed below as leads for review — a screen is not an abandonment and a flag is not a violation.

Rights on file: 8930 across 7705 structure(s); 1 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Abandonment radar (17 screens)

Absolute rights with 10+ years of no recorded diversions. Screens only — storage, alternate points, and plan operations can explain nonuse lawfully. And diversion REPORTING itself only reached its modern level ~2009 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

SNYDER RES (0103342) (1902-03-20, 0.0 cfs decreed): last active 1998 — 26 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
SNOW UDA WL FLD (0110051) (2004-11-30, 0.0 cfs decreed): last active 2006 — 18 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
MORGAN CTY COMMUNITY C W 1-31867 (0107709) (1986-12-29, 0.2 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 47070-F (0109965) (2005-01-01, 0.3 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 56253 (0109976) (2005-01-01, 1.6 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 57064 (0109977) (2005-01-01, 0.3 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 59870 (0109978) (2005-01-01, 0.1 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 59871 (0109979) (2005-01-01, 0.5 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 59872 (0109980) (2005-01-01, 0.3 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse
FT MORGAN WELL 59873 (0109981) (2005-01-01, 0.5 cfs decreed): last active 2007 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2009) -- early absence of record is weak evidence of nonuse

Compliance screens (105 advisory flags)

Screened 168 of 7705 structures with rights (247 have diversion history on file). A flag is a lead for expert review — augmentation plans, exchanges, and free-river conditions can make over-decree diversions lawful and are deliberately not modeled.

CENTRAL AUG HEADGATE WELL GROUP (0104803): Observed p99 daily rate 32.1 cfs (max 61.8) exceeds total decreed absolute 23.4 cfs across 1850 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
TH 17 RANCH RIVER RESERVOIR PUMP (0100913): Observed p99 daily rate 28.4 cfs (max 29.3) exceeds total decreed absolute 4.2 cfs across 1356 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
BOXELDER FLD WTR D 2 (0100616): Observed p99 daily rate 26.4 cfs (max 211.0) exceeds total decreed absolute 21.0 cfs across 11077 recorded day(s).
WIGGINS FARMS WEST PUMP STATION (0100601): Observed p99 daily rate 20.1 cfs (max 30.9) exceeds total decreed absolute 3.3 cfs across 2456 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
FLACK WELL NO 1-14525R (0106539): Observed p99 daily rate 18.1 cfs (max 18.1) exceeds total decreed absolute 1.7 cfs across 2450 recorded day(s).
GROVES FARMS RECHARGE PUMP & PIPELINE (0100569): Observed p99 daily rate 17.4 cfs (max 64.1) exceeds total decreed absolute 16.4 cfs across 10061 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
COCKROFT PUMP 1 (0100598): Observed p99 daily rate 17.2 cfs (max 20.2) exceeds total decreed absolute 4.6 cfs across 2094 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
RIVERSIDE EMPIRE RECHARGE AREA (0102274): Observed p99 daily rate 16.0 cfs (max 16.0) exceeds total decreed absolute 14.4 cfs across 676 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
WESTERN SUGAR W 2-59300 (0109875): Observed p99 daily rate 13.1 cfs (max 14.8) exceeds total decreed absolute 6.6 cfs across 478 recorded day(s).
RIVERSIDE GROVES S RECHARGE AREA (0102087): Observed p99 daily rate 12.8 cfs (max 14.6) exceeds total decreed absolute 10.8 cfs across 948 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Decreed abs (AF)	Conditional?
RIVERSIDE CANAL (0100503)	1876-01-01	21	5834.2	0	yes
BIJOU CANAL (0100507)	1871-10-01	22	3034.3	29779	yes
EMPIRE DITCH (0100501)	1905-05-18	4	2449.9	0	—
NORTH STERLING CANAL (0100687)	1908-06-15	7	1975.0	7800	yes
PREWITT INLET CANAL (0100829)	1910-05-25	4	1390.0	0	yes
JACKSON LAKE RES (0103817)	1901-05-18	4	1357.9	37904	yes
LOWER PLATTE BEAVER D (0100518)	1882-09-04	7	1154.0	0	yes
JACKSON LAKE INLET DITCH (0100513)	1901-05-18	4	800.0	0	—
TREMONT DITCH (0100519)	1887-06-18	8	622.0	0	yes
FT MORGAN CANAL (0100514)	1882-10-18	8	610.6	0	yes
UPPER PLATTE BEAVER CNL (0100515)	1868-04-20	8	542.2	0	yes
CONSOLIDATED LARSON D (0100620)	1885-12-28	5	413.0	0	—
OWL CREEK DITCH (0100902)	1906-04-17	1	400.0	0	—
WELDON VALLEY DITCH (0100511)	1881-10-26	8	279.5	6466	yes
CENTRAL LATERAL (0100675)	1909-07-15	1	250.0	0	—

No inventory or legal-document changes detected since the daily watch began.

If a call were placed at a given seniority, which structures in this basin would be out of priority, and how much of their decreed rate would be curtailed? Computed from this basin's cached decrees.

What this does and doesn't model. Seniority arithmetic only: every right junior to the call is treated as curtailed. It does not model reach applicability — structures downstream of the calling point are not administered by it — and it applies no futile-call judgment. Read it as “who is junior to this date, and by how much,” not as a prediction of what the Division Engineer would actually order.

Pick a calling right

Real decrees from this basin, ordered by administration number — that is, by actual seniority. The years will look out of order, and that is correct: an administration number encodes the adjudication date as well as the appropriation date, so a right appropriated in 1970 can be administered ahead of one from 1950. A senior call curtails almost everything; a junior one curtails almost nothing.

Or enter an administration number directly

Administration number

DWR administration numbers encode appropriation and adjudication dates; lower is more senior.

Stream	Gage	R-mile	Predicted (cfs)	Observed (cfs)	Δ (cfs)	Reach (mi)	Hypothesis
MAINSTEM	SOUTH PLATTE RIVER AT MASTERS, CO. (PLAMASCO)	116.5	0.0	159.4	+159.4	4.3	Unaccounted +159.4 cfs gain over 4.3 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	SOUTH PLATTE RIVER AT MASTERS, CO. (PLAMASCO)	116.5	159.4	0.0	-159.4	0.0	Unaccounted -159.4 cfs loss over 0.0 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	SOUTH PLATTE RIVER NEAR KERSEY, CO (PLAKERCO)	94.8	0.4	146.4	+146.1	1.4	Unaccounted +146.1 cfs gain over 1.4 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	NEW CACHE LOWER CROW CREEK RETURN (NCLCCRCO)	96.9	146.4	1.2	-145.2	2.1	Unaccounted -145.2 cfs loss over 2.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	SOUTH PLATTE RIVER NEAR WELDONA, CO (PLAWELCO)	138.8	0.0	133.2	+133.2	6.5	Unaccounted +133.2 cfs gain over 6.5 mi. Likely cause: stale/missing return data at WELDON VALLEY FT MORGAN FARMS RETURN.
MAINSTEM	WELDON VALLEY DITCH RETURN (WELRETCO)	139.0	133.2	17.0	-116.2	0.2	Unaccounted -116.2 cfs loss over 0.2 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR BALZAC (PLABALCO)	164.7	0.0	116.0	+116.0	0.8	Unaccounted +116.0 cfs gain over 0.8 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR BALZAC (PLABALCO)	164.7	116.0	0.0	-116.0	0.0	Unaccounted -116.0 cfs loss over 0.0 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	CORONA DITCH (CORDITCO)	110.1	0.0	105.4	+105.4	0.0	Unaccounted +105.4 cfs gain over 0.0 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	RIVERSIDE CANAL AT RESERVOIR INLET GAGE (RIVCANCO)	112.2	105.4	0.0	-105.4	2.1	Unaccounted -105.4 cfs loss over 2.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	WELDON VALLEY DITCH (WELDITCO)	122.0	0.0	102.8	+102.8	1.9	Unaccounted +102.8 cfs gain over 1.9 mi. Likely cause: stale/missing return data at BIJOU OWW PUTNAM RT.
MAINSTEM	WELDON VALLEY HAWKINS AUG RTN (WVHRTNCO)	128.6	102.8	0.0	-102.8	6.5	Unaccounted -102.8 cfs loss over 6.5 mi. Returns in this reach with stale data (WIGGINS TOWN RO PLANT RETURN TO RIVER, TIMBRO RANCH AUG RETURN FLOW IMPACT REAC) — over-reporting elsewhere is also possible.
MAINSTEM	UPPER PLATTE AND BEAVER DITCH (UPBDITCO)	144.8	97.1	16.7	-80.4	0.0	Unaccounted -80.4 cfs loss over 0.0 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	UPPER PLATTE AND BEAVER DITCH (UPBDITCO)	144.8	17.0	97.1	+80.1	5.8	Unaccounted +80.1 cfs gain over 5.8 mi. Likely cause: stale/missing return data at WELDON VALLEY DITCH RT, WELDON VALLEY CNL FRICO/ECCV RETURN.
MAINSTEM	SOUTH PLATTE RIVER AT FORT MORGAN, CO (PLAMORCO)	146.9	16.7	91.3	+74.6	2.1	Unaccounted +74.6 cfs gain over 2.1 mi. Likely cause: stale/missing return data at FT MORGAN WESTERN SUGAR RT.
MAINSTEM	LOWER PLATTE AND BEAVER CANAL @ 20 FT PARSHALL FLUME (LOPLABCO)	152.8	68.3	0.0	-68.3	0.0	Unaccounted -68.3 cfs loss over 0.0 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	LOWER PLATTE AND BEAVER CANAL @ 20 FT PARSHALL FLUME (LOPLABCO)	152.8	91.3	68.3	-23.0	5.9	Unaccounted -23.0 cfs loss over 5.9 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	JACKSON LAKE OUTLET NEAR FORT MORGAN (JACKLACO)	128.9	0.0	20.6	+20.6	0.3	Unaccounted +20.6 cfs gain over 0.3 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	FORT MORGAN CANAL NEAR WIGGINS, CO (MORCANCO)	132.3	20.6	0.0	-20.6	3.5	Unaccounted -20.6 cfs loss over 3.5 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ILLINOIS DITCH (ILLDITCO)	102.6	1.2	13.0	+11.8	5.6	Unaccounted +11.8 cfs gain over 5.6 mi. Likely cause: stale/missing return data at LOWER LATHAM RT TO BOX ELDER CREEK.
MAINSTEM	ILLINOIS DITCH ECCV RTN (ILLRTNCO)	104.1	13.0	1.5	-11.5	1.5	Unaccounted -11.5 cfs loss over 1.5 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	LOWER LATHAM END OF DITCH RETURN (LOLRTNCO)	106.3	0.0	6.5	+6.5	0.6	Unaccounted +6.5 cfs gain over 0.6 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	TH 17 RANCH RIVER PUMP (TH17RNCO)	106.4	6.5	0.2	-6.4	0.1	Unaccounted -6.4 cfs loss over 0.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.

Gage ⇅	Station ⇅	Avg cfs Aug 17–Aug 23 ⇅	% Hist Median ⇅	Rank ⇅	Δ1wk ⇅	Δ4wk ⇅	Yrs ⇅	Status ⇅
0101794A	ANTELOPE BEACH RECHARGE AREA	0.0	0%	0	+0	+0	0.0	NO_DATA
NCLTCRCO	NEW CACHE LONE TREE CREEK RETURN	0.3	5%	0	-4	-2	5.8	STALE
JBCDITCO	JB COOKE DITCH	0.4	3%	0	-2	-2	5.5	STALE
PLAMASCO	SOUTH PLATTE RIVER AT MASTERS, CO.	159.4	42%	0	+33	+50	27.3	SHORT_RECORD
STECANCO	NORTH STERLING CANAL	0.0	0%	0	+0	+0	28.2	SHORT_RECORD
UNIDITCO	UNION DITCH	0.0	0%	0	+0	+0	18.3	SHORT_RECORD
WELDITCO	WELDON VALLEY DITCH	102.8	82%	0	-31	-40	18.9	SHORT_RECORD
JACDITCO	JACKSON LAKE INLET DITCH	0.0	0%	0	+0	+0	18.6	SHORT_RECORD
TRMDITCO	TREMONT DITCH	0.0	0%	0	+0	+0	18.7	SHORT_RECORD
EMPINLCO	EMPIRE INLET AT RESERVOIR	0.0	0%	0	+0	+0	18.6	SHORT_RECORD
CORDITCO	CORONA DITCH	0.0	0%	0	+0	+0	15.9	SHORT_RECORD
WVHRTNCO	WELDON VALLEY HAWKINS AUG RTN	0.0	0%	0	-0	-0	6.3	SHORT_RECORD
70ROUTCO	70 RANCH RESERVOIR OUTLET	0.0	0%	0	-0	-0	6.7	SHORT_RECORD
LOLRTNCO	LOWER LATHAM END OF DITCH RETURN	6.5	35%	0	+2	+4	8.0	SHORT_RECORD
NCLSCRCO	NEW CACHE LOWER SAND CREEK RETURN	0.6	29%	0	-1	-1	6.0	SHORT_RECORD
OGLFDRCO	OGILVY DITCH LONE TREE CREEK FEEDER	0.0	0%	0	+0	+0	5.9	SHORT_RECORD
0100569A	FORT MORGAN CANAL GROVES PIPELINE	0.0	0%	0	+0	+0	1.4	SHORT_RECORD
0100936A	JACKSON DAY SEEP	0.0	0%	0	+0	+0	1.2	SHORT_RECORD
WELRETCO	WELDON VALLEY DITCH RETURN	17.0	75%	7	-2	-2	19.9	SHORT_RECORD
JACKLACO	JACKSON LAKE OUTLET NEAR FORT MORGAN	20.6	36%	11	-99	-189	22.6	SHORT_RECORD
LOPLABCO	LOWER PLATTE AND BEAVER CANAL @ 20 FT PARSHALL FLUME	68.3	71%	25	+40	-7	27.9	SHORT_RECORD
ILLRTNCO	ILLINOIS DITCH ECCV RTN	1.5	96%	25	+0	-0	5.8	SHORT_RECORD
NCLCCRCO	NEW CACHE LOWER CROW CREEK RETURN	1.2	60%	26	-0	-1	6.0	SHORT_RECORD
DEUDITCO	DEUEL SNYDER CANAL	16.7	78%	33	+13	+12	18.8	SHORT_RECORD
UPBDITCO	UPPER PLATTE AND BEAVER DITCH	97.1	89%	37	+6	+0	18.7	SHORT_RECORD
70RRINCO	70 RANCH RESERVOIR INLET FROM RIVER PUMP	1.0	73%	43	+1	+0	6.7	SHORT_RECORD
BIJOUSCO	BIJOU CANAL	105.4	98%	45	+11	+34	28.2	SHORT_RECORD
TH17RNCO	TH 17 RANCH RIVER PUMP	0.2	154%	52	+0	-0	6.9	SHORT_RECORD
ILLDITCO	ILLINOIS DITCH	13.0	103%	56	-0	-1	15.4	SHORT_RECORD
PLAMORCO	SOUTH PLATTE RIVER AT FORT MORGAN, CO	91.3	45%	0	-9	-29	48.6	OK
PLABALCO	SOUTH PLATTE RIVER AT COOPER BRIDGE NEAR BALZAC	116.0	47%	0	-78	-22	38.6	OK
PLAWELCO	SOUTH PLATTE RIVER NEAR WELDONA, CO	133.2	43%	0	+3	-26	82.3	OK
MORCANCO	FORT MORGAN CANAL NEAR WIGGINS, CO	106.7	47%	0	-28	-30	33.1	OK
RIVCANCO	RIVERSIDE CANAL AT RESERVOIR INLET GAGE	0.0	0%	0	+0	+0	31.9	OK
PLAKERCO	SOUTH PLATTE RIVER NEAR KERSEY, CO	146.4	53%	17	-2	+32	157.3	OK