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Arkansas: Fowler to Las Animas

Division 2 · Water District 17 · As of 2026-08-23 03:00 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 08:39 from 57 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 57 gages with enough record, 16 are trending down and 0 up, and 15 carry a detected shift. The clearest is PURGATOIRE RIVER AT NINEMILE DAM NEAR HIGBEE, -23.7 points of its long-term median per decade over 102 years (p<0.0001). The other 39 show no clear signal either way.

Gage	Trend	Change / decade points of median	Significance	Years	Changepoint
▸ BOB CREEK AT COLORADO CANAL BOBCRKCO	↓ decreasing	-35851.0	p=0.000	24	~2000
▸ FORT LYON AUG STATION AT HORSE CREEK FLYAUGCO	↓ decreasing	-971.9	p=0.001	13	~2015
▸ NINEMILE CANAL AT NINEMILE DAM NEAR HIGBEE NMCHIGCO	↓ decreasing	-65.0	p=0.000	47	~2001
▸ DOUGLAS RESERVOIR AT SMITH RANCH NEAR RUSH (OUTFLOW) DOUOUTCO	↓ decreasing	-52.3	p=0.001	27	~2017
▸ BRETT GRAY RESERVOIR AT SMITH RANCH NEAR RUSH (OUT BREOUTCO	↓ decreasing	-48.8	p=0.040	24	—
▸ ARKANSAS RIVER AT CATLIN DAM NEAR FOWLER ARKCATCO	↓ decreasing	-41.2	p=0.000	37	~2000
▸ PURGATOIRE RIVER NEAR LAS ANIMAS, CO. PURLASCO	↓ decreasing	-29.2	p=0.000	88	~1973
▸ ROCKY FORD DITCH NEAR MANZANOLA RFDMANCO	↓ decreasing	-27.7	p=0.000	35	~2007
▸ PURGATOIRE RIVER AT NINEMILE DAM NEAR HIGBEE PURNINCO	↓ decreasing	-23.7	p=0.000	102	~1988
▸ APISHAPA RIVER NEAR FOWLER, CO APIFOWCO	↓ decreasing	-21.0	p=0.000	92	~1971
▸ ARKANSAS RIVER NEAR ROCKY FORD ARKROCCO	↓ decreasing	-20.3	p=0.004	34	~2000
▸ ARKANSAS RIVER AND CATLIN CANAL (COMBINED) ARKCACCO	↓ decreasing	-19.8	p=0.028	29	~2000
▸ FORT LYON CANAL FLYCANCO	↓ decreasing	-11.4	p=0.035	37	—
▸ CONSOLIDATED DITCH NEAR RIVERDALE CONDITCO	↓ decreasing	-11.0	p=0.045	29	—
▸ ROCKY FORD RETURN FOR AURORA RFDRETCO	↓ decreasing	-8.3	p=0.007	33	~2001
▸ TIMPAS CREEK AT MOUTH NEAR SWINK, CO. TIMSWICO	↓ decreasing	-7.1	p=0.004	63	~1973
▸ ARKANSAS RIVER AT LAS ANIMAS, CO. ARKLASCO	no clear trend	+6.2	p=0.167	88	~1979
▸ ARKANSAS RIVER AT LA JUNTA, CO ARKLAJCO	no clear trend	-0.4	p=0.866	115	~1979

39 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. 43 gage(s) and 49 structure(s) report in 2026, but structure reporting only reached half its modern level around ~2017. 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)
1910s	1	10
1920s	4	12
1930s	3	13
1940s	8	13
1950s	6	13
1960s	5	14
1970s	7	40
1980s	12	24
1990s	26	30
2000s	30	40
2010s	38	47
2020s	40	49

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 1% of 2617 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 (4051 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.

ARKANSAS RIVER AT LA JUNTA, CO: reach shifted from +302 cfs to -135 cfs summer mean (more losing, p=0.000, 77 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [74 alluvial wells within 2 mi of the gage; pooled water table +2.3 ft (1959–2018, increasing)]
ARKANSAS RIVER AT LAS ANIMAS, CO.: reach shifted from -93 cfs to +329 cfs summer mean (more gaining, p=0.000, 77 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.51) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [43 alluvial wells within 2 mi of the gage; pooled water table +0.3 ft (1955–2023, no_trend)]
TIMPAS CREEK AT MOUTH NEAR SWINK, CO.: reach shifted from -270 cfs to +82 cfs summer mean (more gaining, p=0.000, 58 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [33 alluvial wells within 2 mi of the gage; pooled water table +2549.3 ft (1959–2023, no_trend)]
HOLBROOK CANAL AT MILE 3.4 NEAR ROCKY FORD: reach shifted from -7 cfs to +125 cfs summer mean (more gaining, p=0.010, 41 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.44) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [19 alluvial wells within 2 mi of the gage; pooled water table -0.3 ft (1960–2011, decreasing)]
PURGATOIRE RIVER NEAR LAS ANIMAS, CO.: reach shifted from -43 cfs to -255 cfs summer mean (more losing, p=0.001, 77 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [17 alluvial wells within 2 mi of the gage; pooled water table +1585.6 ft (1959–2023, no_trend)]
HORSE CREEK AT HIGHWAY 194: reach shifted from -114 cfs to +23 cfs summer mean (more gaining, p=0.000, 34 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.6) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [21 alluvial wells within 2 mi of the gage; pooled water table +95267.5 ft (1958–2018, increasing)]

Groundwater now has its own tab: 1087 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 22 reservoir(s), end-of-year storage back to 1950, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 88-year window with full coverage (1939–2026), the dominant shared pattern across 4 gage(s) explains 84% 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 2026-07-06)

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.

COLO CANAL RETURN FLOWS (return): +57.8 cfs (50% of that reach's correction)
CITY OF ROCKY FORD WWTP RETURNS (return): +57.8 cfs (50% of that reach's correction)
BENT FORT WWTP RETURNS (return): -16.9 cfs (100% of that reach's correction)
LAS ANIMAS R/O RETURN FLOWS (return): +9.3 cfs (100% of that reach's correction)

Data provenance & quality

Where these numbers come from and how far they can be trusted. Grade C (3/6 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 45 day(s) old (target 7)
diversion record	expected-lag	newest diversion record is 293 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	sparse	1% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 667,373 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 — 95.75% day-level agreement with USGS's own published records for the same gages, across 17 co-listed station(s) and 225,167 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.

57 gage(s) / 584,090 daily values (1912-04-01–2026-07-06); 175 structure(s) with diversion records; 1909 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

21,337 water-level measurements across 1087 monitored well(s) — 917 alluvial, 29 bedrock — plus 5 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 287 well(s) with enough record for a trend test: 54 declining, 70 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ SC01406125DDB1	unknown	-9.13	35 yr	0.0
▸ HC35	unknown	-5.37	14 yr	0.0012
▸ HC34	unknown	-5.34	14 yr	0.0
▸ HC13	alluvial	-4.76	14 yr	0.002
▸ HC37	unknown	-4.53	14 yr	0.0
▸ HC20	alluvial	-4.35	14 yr	0.0005
▸ HC33	unknown	-4.28	14 yr	0.0
▸ HC38	unknown	-3.8	14 yr	0.0

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.

ARKANSAS RIVER AT LA JUNTA, CO: 74 alluvial well(s) nearby; pooled water table +2.3 ft (1959–2018, increasing, p=0.0). Glover screen: 0.0 cfs of nearby metered alluvial pumping → est. lagged depletion 0.0–0.0 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

ARKANSAS RIVER AT LAS ANIMAS, CO.: 43 alluvial well(s) nearby; pooled water table +0.3 ft (1955–2023, no_trend, p=0.0527). Glover screen: 0.0 cfs of nearby metered alluvial pumping → est. lagged depletion 0.0–0.0 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

TIMPAS CREEK AT MOUTH NEAR SWINK, CO.: 33 alluvial well(s) nearby; pooled water table +2549.3 ft (1959–2023, no_trend, p=0.6098)

HOLBROOK CANAL AT MILE 3.4 NEAR ROCKY FORD: 19 alluvial well(s) nearby; pooled water table -0.3 ft (1960–2011, decreasing, p=0.0029)

PURGATOIRE RIVER NEAR LAS ANIMAS, CO.: 17 alluvial well(s) nearby; pooled water table +1585.6 ft (1959–2023, no_trend, p=0.8575)

HORSE CREEK AT HIGHWAY 194: 21 alluvial well(s) nearby; pooled water table +95267.5 ft (1958–2018, increasing, p=0.0002)

APISHAPA RIVER NEAR FOWLER, CO: 47 alluvial well(s) nearby; pooled water table +0.1 ft (1959–2023, no_trend, p=0.7412)

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.

22 reservoir(s) with 10,582 storage measurement(s), 1950–2024.

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
▸ LAKE MEREDITH (1703525)	11,386	2021-10-01
▸ FORT LYON STORAGE CANAL (1700648)	10,758	2007-10-26
▸ ADOBE CREEK RESERVOIR (1703546)	9,807	2021-10-01
▸ LAKE HENRY (1703524)	1,642	2022-10-28
▸ BROWN RESERVOIR (1703562)	500	2014-08-10
▸ WINDMILL LAKE RESERVOIR (1703595)	110	2017-10-31
▸ RED TOP RESERVOIR (1703564)	78	2014-08-10
▸ BOX SPRINGS RES NO 3 (1703573)	71	2014-10-30

Decreed rights on this network run from 1861-12-31 to 2022-09-21. 20 abandonment screens and 19 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: 2077 across 1909 structure(s); 71 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Abandonment radar (20 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 ~2017 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

CLUTE SPRING DITCH (1700627) (1948-07-31, 1.0 cfs decreed): last active 1980 — 45 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
FOULK DITCH & IRRIG SYS (1700564) (1954-01-01, 3.0 cfs decreed): last active 1982 — 43 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
1700575 (1948-12-02, 5.0 cfs decreed): last active 1983 — 42 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
CROWLEY COUNTY WELL NO 3 (1706019) (1981-08-31, 0.6 cfs decreed): last active 1983 — 42 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
ADOBE CREEK FEEDER (1700674) (1906-01-25, 17262.0 cfs decreed): last active 2007 — 18 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
MUSTANG RESERVOIR CANAL (1700608) (1902-03-17, 5.0 cfs decreed): last active 2009 — 16 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
MCCABE DITCH NO 1 (1700660) (1905-09-09, 10.0 cfs decreed): last active 2010 — 15 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
MCCABE DITCH NO 2 (1700688) (1905-09-09, 10.0 cfs decreed): last active 2010 — 15 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
DOUGLAS - GORDON RES (1703912) (1919-04-16, 0.0 cfs decreed): last active 2010 — 15 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse
DAWN POND (1703508) (1964-10-22, 0.0 cfs decreed): last active 2011 — 14 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~2017) -- early absence of record is weak evidence of nonuse

Compliance screens (19 advisory flags)

Screened 59 of 1909 structures with rights (71 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.

CROOKED ARROYA DITCH (1700578): Observed p99 daily rate 1710.0 cfs (max 1710.0) exceeds total decreed absolute 27.2 cfs across 12241 recorded day(s).
BEST DITCH HEADGATE 1 (1700605): Observed p99 daily rate 301.3 cfs (max 325.0) exceeds total decreed absolute 50.0 cfs across 196 recorded day(s).
BEER DITCH (1700561): Observed p99 daily rate 230.0 cfs (max 230.0) exceeds total decreed absolute 100.0 cfs across 166 recorded day(s).
HORSE CREEK & BLACK DRAW DITCH (1700592): Observed p99 daily rate 225.0 cfs (max 255.0) exceeds total decreed absolute 190.5 cfs across 180 recorded day(s).
MUSTANG RESERVOIR CANAL (1700608): Observed p99 daily rate 151.2 cfs (max 152.0) exceeds total decreed absolute 5.0 cfs across 218 recorded day(s).
LAS ANIMAS CONSOLIDATED (1700556): Observed p99 daily rate 131.3 cfs (max 190.0) exceeds total decreed absolute 94.6 cfs across 70259 recorded day(s).
1700541: Observed p99 daily rate 131.0 cfs (max 442.0) exceeds total decreed absolute 129.4 cfs across 74187 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
ROCKY FORD DITCH (1700558): Observed p99 daily rate 120.0 cfs (max 631.0) exceeds total decreed absolute 116.2 cfs across 81054 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
MCCABE DITCH NO 1 (1700660): Observed p99 daily rate 90.0 cfs (max 90.0) exceeds total decreed absolute 10.0 cfs across 60 recorded day(s).
CROWLEY COUNTY WELL NO 3 (1706019): Observed p99 daily rate 37.2 cfs (max 37.2) exceeds total decreed absolute 0.6 cfs across 46 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Conditional?
ADOBE CREEK FEEDER (1700674)	1906-01-25	2	17262.0	—
HORSE CREEK SUPPLY DITCH (1700673)	1900-08-15	3	12000.0	—
FORT LYON STORAGE CANAL (1700648)	1884-04-15	7	3986.0	—
HOLBROOK CANAL (1700554)	1889-09-25	8	2800.0	—
FORT LYON CANAL (1700553)	1884-04-15	8	2438.2	—
KICKINGBIRD CANAL (1700555)	1896-08-01	1	1150.0	—
1700540	1881-03-10	9	756.3	—
1700542	1861-12-31	8	501.6	—
OTERO CANAL (1700557)	1890-03-03	2	457.9	—
BOX SPRINGS CANAL NO 1 (1700586)	1899-10-24	3	414.5	—
CATLIN CANAL (1700552)	1875-04-10	3	345.0	—
HORSE CREEK & BLACK DRAW DITCH (1700592)	1899-06-06	2	190.5	—
1700541	1867-09-21	2	129.4	—
ROCKY FORD DITCH (1700558)	1874-05-15	3	116.2	—
BEER DITCH (1700561)	1903-03-15	1	100.0	—

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	ROCKY FORD DITCH NEAR MANZANOLA (RFDMANCO)	48.3	0.0	51.5	+51.5	1.2	Unaccounted +51.5 cfs gain over 1.2 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	MEREDITH RESERVOIR (OUTFLOW) (MEROUTCO)	51.1	51.5	5.7	-45.9	2.8	Unaccounted -45.9 cfs loss over 2.8 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER AT CATLIN DAM NEAR FOWLER (ARKCATCO)	37.3	0.0	44.8	+44.8	0.3	Unaccounted +44.8 cfs gain over 0.3 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	ARKANSAS RIVER NEAR ROCKY FORD (ARKROCCO)	56.8	3.5	42.9	+39.4	5.2	Unaccounted +39.4 cfs gain over 5.2 mi. Likely cause: stale/missing return data at COLO CANAL RETURN FLOWS, CITY OF ROCKY FORD WWTP RETURNS.
MAINSTEM	FORT LYON STORAGE CANAL (FLSCANCO)	39.5	36.2	0.0	-36.2	2.1	Unaccounted -36.2 cfs loss over 2.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	HOLBROOK RESERVOIR INFLOW (HOLINFCO)	60.1	33.6	0.0	-33.6	0.4	Unaccounted -33.6 cfs loss over 0.4 mi. Returns in this reach with stale data (BENT FORT WWTP RETURNS) — over-reporting elsewhere is also possible.
MAINSTEM	CONSOLIDATED DITCH NEAR RIVERDALE (CONDITCO)	80.2	0.0	22.1	+22.1	0.5	Unaccounted +22.1 cfs gain over 0.5 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	ADOBE CREEK BELOW ADOBE RESERVOIR (ADOBARCO)	85.4	22.1	0.0	-22.1	5.2	Unaccounted -22.1 cfs loss over 5.2 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	TIMPAS CREEK AT MOUTH NEAR SWINK, CO. (TIMSWICO)	62.6	0.0	21.0	+21.0	1.6	Unaccounted +21.0 cfs gain over 1.6 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	HOLBROOK RESERVOIR OUTFLOW (HOLOUTCO)	63.2	21.0	0.0	-21.0	0.5	Unaccounted -21.0 cfs loss over 0.5 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER AT LAS ANIMAS, CO. (ARKLASCO)	95.0	0.0	20.9	+20.9	9.3	Unaccounted +20.9 cfs gain over 9.3 mi. Likely cause: stale/missing return data at LAS ANIMAS R/O RETURN FLOWS.
MAINSTEM	PURGATOIRE RIVER NEAR LAS ANIMAS, CO. (PURLASCO)	99.9	20.9	0.4	-20.5	4.9	Unaccounted -20.5 cfs loss over 4.9 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	FORT LYON CANAL (FLYCANCO)	59.5	42.9	27.7	-15.2	2.7	Unaccounted -15.2 cfs loss over 2.7 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ROCKY FORD RETURN FOR AURORA (RFDRETCO)	37.5	44.8	36.2	-8.6	0.2	Unaccounted -8.6 cfs loss over 0.2 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER AT LA JUNTA, CO (ARKLAJCO)	59.8	27.7	33.6	+5.9	0.3	Unaccounted +5.9 cfs gain over 0.3 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	PURGATOIRE RIVER BLW HIGHLAND DAM NR LAS ANIMAS (PURHILCO)	74.3	5.9	0.0	-5.9	0.0	Unaccounted -5.9 cfs loss over 0.0 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	PURGATOIRE RIVER BLW HIGHLAND DAM NR LAS ANIMAS (PURHILCO)	74.3	0.6	5.9	+5.3	3.2	Unaccounted +5.3 cfs gain over 3.2 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.

Gage ⇅	Station ⇅	Avg cfs Aug 10–Aug 16 ⇅	% Hist Median ⇅	Rank ⇅	Δ1wk ⇅	Δ4wk ⇅	Yrs ⇅	Status ⇅
BOBCRKCO	BOB CREEK AT COLORADO CANAL	0.0	0%	0	+0	+0	0.0	NO_DATA
HILCANCO	HIGHLAND CANAL	0.0	0%	0	+0	+0	25.8	SHORT_RECORD
ADOBARCO	ADOBE CREEK BELOW ADOBE RESERVOIR	0.5	1%	0	-1	+0	19.5	SHORT_RECORD
FLYAUGCO	FORT LYON AUG STATION AT HORSE CREEK	0.0	0%	0	+0	+0	14.1	SHORT_RECORD
ADOVALCO	ADOBE VALLEY DITCH	0.0	0%	0	+0	+0	17.2	SHORT_RECORD
ADOAARCO	ADOBE CREEK ABOVE ADOBE RESERVOIR	0.0	0%	0	+0	+0	16.5	SHORT_RECORD
OTECAFCO	OTERO CANAL NEAR FOWLER	0.0	0%	0	+0	+0	15.3	SHORT_RECORD
CATAGTCO	CATLIN AUGMENTATION STATION AT TIMPAS CREEK	0.0	0%	0	-3	-3	12.2	SHORT_RECORD
CATAGCCO	CATLIN AUGMENTATION STATION AT CROOKED ARROYO	0.0	0%	0	-2	-1	12.2	SHORT_RECORD
ARF049CO	ARF HEADGATE 49-D (HORSE CREEK)	0.0	0%	0	+0	+0	9.3	SHORT_RECORD
CONDITCO	CONSOLIDATED DITCH NEAR RIVERDALE	22.1	41%	4	+13	+19	27.8	SHORT_RECORD
DOUOUTCO	DOUGLAS RESERVOIR AT SMITH RANCH NEAR RUSH (OUTFLOW)	0.0	2%	5	+0	+0	25.9	SHORT_RECORD
PURHILCO	PURGATOIRE RIVER BLW HIGHLAND DAM NR LAS ANIMAS	5.9	16%	10	+6	+6	25.8	SHORT_RECORD
ARF027CO	ARF HEADGATE 27 (BENTS FORT)	0.0	0%	25	+0	+0	9.0	SHORT_RECORD
BREOUTCO	BRETT GRAY RESERVOIR AT SMITH RANCH NEAR RUSH (OUT	0.2	50%	32	+0	+0	23.5	SHORT_RECORD
HOLOUTCO	HOLBROOK RESERVOIR OUTFLOW	0.0	0%	50	+0	+0	9.8	SHORT_RECORD
HENOUTCO	LAKE HENRY RESERVOIR (OUTFLOW)	3.2	101%	50	+3	+3	26.3	SHORT_RECORD
HOLINFCO	HOLBROOK RESERVOIR INFLOW	0.0	0%	75	+0	+0	9.9	SHORT_RECORD
RFDRETCO	ROCKY FORD RETURN FOR AURORA	36.2	137%	85	-15	+32	29.6	SHORT_RECORD
ARF27LCO	ARF HEADGATE 27 (BENTS FORT, LOWER)	0.6	0%	88	+1	+0	8.8	SHORT_RECORD
1700551A	BALDWIN STUBBS DITCH	0.0	157%	100	+0	-3	1.4	SHORT_RECORD
CATCANCO	CATLIN CANAL AT CATLIN DAM NEAR FOWLER	0.0	0%	0	-39	-121	46.8	OK
CANSWKCO	CROOKED ARROYO NEAR SWINK, CO.	1.0	6%	0	-1	-0	58.4	OK
NMCHIGCO	NINEMILE CANAL AT NINEMILE DAM NEAR HIGBEE	0.0	0%	0	+0	+0	46.8	OK
ARKLAJCO	ARKANSAS RIVER AT LA JUNTA, CO	33.6	24%	0	+15	+9	114.3	OK
ARKLASCO	ARKANSAS RIVER AT LAS ANIMAS, CO.	20.9	18%	0	+12	-0	87.1	OK
ARKCATCO	ARKANSAS RIVER AT CATLIN DAM NEAR FOWLER	44.8	9%	0	-13	+42	36.8	OK
TIMSWICO	TIMPAS CREEK AT MOUTH NEAR SWINK, CO.	21.0	28%	0	-4	+3	62.1	OK
PURLASCO	PURGATOIRE RIVER NEAR LAS ANIMAS, CO.	0.4	1%	0	-2	-1	87.7	OK
HRC194CO	HORSE CREEK AT HIGHWAY 194	0.1	1%	0	-0	-0	37.3	OK
FLYCANCO	FORT LYON CANAL	27.7	8%	0	-110	+28	37.2	OK
ARKROCCO	ARKANSAS RIVER NEAR ROCKY FORD	42.9	10%	0	-31	+31	33.2	OK
FLSCANCO	FORT LYON STORAGE CANAL	0.0	0%	0	+0	+0	32.9	OK
HOLCANCO	HOLBROOK CANAL AT MILE 3.4 NEAR ROCKY FORD	0.0	0%	0	+0	+0	39.4	OK
APIFOWCO	APISHAPA RIVER NEAR FOWLER, CO	3.2	20%	1	-5	+2	90.6	OK
SUGARCCO	SUGAR CITY FLUME SUGAR CITY	0.2	1%	7	-2	+0	36.2	OK
MEROUTCO	MEREDITH RESERVOIR (OUTFLOW)	5.7	10%	17	-41	-7	36.6	OK
RFDMANCO	ROCKY FORD DITCH NEAR MANZANOLA	51.5	92%	30	-21	+42	31.5	OK
MERINFCO	MEREDITH RESERVOIR (INFLOW NEAR ORDWAY)	3.5	169%	51	+2	+4	36.1	OK
PURNINCO	PURGATOIRE RIVER AT NINEMILE DAM NEAR HIGBEE	173.1	219%	77	+173	+173	101.8	OK