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Arkansas: Portland to Fowler

Division 2 · Water District 14 · As of 2026-08-21 03:03 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 08:36 from 38 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 38 gages with enough record, 10 are trending down and 0 up, and 11 carry a detected shift. The clearest is HUERFANO RIVER BELOW HUERFANO VALLEY DAM NEAR UNDERCLIFFE, -155.8 points of its long-term median per decade over 49 years (p<0.0001). The other 26 show no clear signal either way.

Gage	Trend	Change / decade points of median	Significance	Years	Changepoint
▸ HUERFANO RIVER NEAR BOONE, CO. HUEBOOCO	↓ decreasing	-181.7	p=0.001	51	~1999
▸ HUERFANO RIVER BELOW HUERFANO VALLEY DAM NEAR UNDERCLIFFE HUEBAMCO	↓ decreasing	-155.8	p=0.000	49	~2008
▸ ARKANSAS RIVER TRIBUTARY ABOVE HWY 227 AT PUEBLO ARK227CO	↓ decreasing	-41.7	p=0.001	22	~2015
▸ ARKANSAS RIVER AT NEPESTA, CO. ARKANECO	↓ decreasing	-37.3	p=0.003	21	—
▸ ARKANSAS RIVER ABOVE PUEBLO ARKPUECO	↓ decreasing	-15.8	p=0.000	61	~2000
▸ ARKANSAS RIVER AT MOFFAT STREET AT PUEBLO, CO ARKMOFCO	↓ decreasing	-11.9	p=0.044	38	~2000
▸ OXFORD FARMERS DITCH COMPANY OXFDITCO	↓ decreasing	-10.0	p=0.041	40	~2000
▸ ROCKY FORD HIGHLINE CANAL AT MILE 4.9 NEAR BOONE RFHCANCO	no clear trend	-7.5	p=0.077	39	~2001
▸ SALT CREEK NEAR MOUTH BELOW PUEBLO SALTMOCO	↓ decreasing	-6.0	p=0.010	18	~2015
▸ ARKANSAS RIVER NEAR PUEBLO, CO. ARKPUNCO	↓ decreasing	-5.2	p=0.003	81	~1930
▸ ARKANSAS RIVER AT NEPESTA BRIDGE NEAR NEPESTA, CO ARKNEPCO	↓ decreasing	-3.7	p=0.035	91	~2000
▸ ARKANSAS RIVER NEAR AVONDALE, CO. ARKAVOCO	no clear trend	-1.8	p=0.164	75	~2000

26 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. 28 gage(s) and 29 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1965. 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)
1890s	1	0
1900s	1	0
1910s	2	6
1920s	2	6
1930s	2	6
1940s	6	10
1950s	3	9
1960s	5	11
1970s	5	12
1980s	6	15
1990s	8	12
2000s	12	20
2010s	14	26
2020s	28	27

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 1% of 2811 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 (1908 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 TRIBUTARY ABOVE HWY 227 AT PUEBLO: reach shifted from -1136 cfs to -678 cfs summer mean (more gaining, p=0.032, 22 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [16 alluvial wells within 2 mi of the gage; pooled water table +0.4 ft (1963–2023, no_trend)]
HUERFANO RIVER NEAR BOONE, CO.: reach shifted from -1917 cfs to -1029 cfs summer mean (more gaining, p=0.004, 45 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [38 alluvial wells within 2 mi of the gage; pooled water table -188.7 ft (1900–2023, increasing)]
ROCKY FORD HIGHLINE CANAL AT MILE 4.9 NEAR BOONE: reach shifted from +187 cfs to -526 cfs summer mean (more losing, p=0.000, 42 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=-0.65) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [29 alluvial wells within 2 mi of the gage; pooled water table -174.6 ft (1900–2020, increasing)]
ARKANSAS RIVER ABOVE PUEBLO: reach shifted from -44 cfs to +773 cfs summer mean (more gaining, p=0.005, 28 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=0.71) -- part of it may be unaccounted water becoming accounted, not hydrologic change]
ARKANSAS RIVER NEAR AVONDALE, CO.: reach shifted from +94 cfs to +1151 cfs summer mean (more gaining, p=0.000, 64 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=0.66) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [31 alluvial wells within 2 mi of the gage; pooled water table -2.3 ft (1962–2023, no_trend)]
ARKANSAS RIVER AT NEPESTA BRIDGE NEAR NEPESTA, CO: reach shifted from -228 cfs to +649 cfs summer mean (more gaining, p=0.000, 77 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=0.42) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [11 alluvial wells within 2 mi of the gage; pooled water table -0.6 ft (1962–2023, increasing)]

Groundwater now has its own tab: 541 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 14 reservoir(s), end-of-year storage back to 1950, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 61-year window with full coverage (1966–2026), the dominant shared pattern across 3 gage(s) explains 93% 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.

COMANCHE RETURN FLOW (return): -38.1 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 299,698 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 — 99.21% day-level agreement with USGS's own published records for the same gages, across 15 co-listed station(s) and 161,752 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.

38 gage(s) / 285,026 daily values (1894-10-01–2026-07-06); 82 structure(s) with diversion records; 1358 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

17,937 water-level measurements across 541 monitored well(s) — 498 alluvial, 0 bedrock — plus 7 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 107 well(s) with enough record for a trend test: 28 declining, 25 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ SC02006435ADB	alluvial	-4.92	12 yr	0.0441
▸ SC02006335BBC	alluvial	-2.79	18 yr	0.0019
▸ SC02006436BCD	alluvial	-2.39	19 yr	0.0001
▸ SC02006328CCD1	alluvial	-2.19	19 yr	0.0
▸ SC02006334BAA2	alluvial	-2.13	24 yr	0.0001
▸ SC02006334CAA	alluvial	-2.11	15 yr	0.0002
▸ ARK-008 MAYES WELL NO 1	alluvial	-2.1	26 yr	0.0112
▸ SC02006333ABA2	alluvial	-1.91	29 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 TRIBUTARY ABOVE HWY 227 AT PUEBLO: 16 alluvial well(s) nearby; pooled water table +0.4 ft (1963–2023, no_trend, p=0.5912). Glover screen: 0.2 cfs of nearby metered alluvial pumping → est. lagged depletion 0.2–0.2 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

HUERFANO RIVER NEAR BOONE, CO.: 38 alluvial well(s) nearby; pooled water table -188.7 ft (1900–2023, increasing, p=0.0)

ROCKY FORD HIGHLINE CANAL AT MILE 4.9 NEAR BOONE: 29 alluvial well(s) nearby; pooled water table -174.6 ft (1900–2020, increasing, p=0.0)

ARKANSAS RIVER ABOVE PUEBLO: 5 alluvial well(s) nearby

ARKANSAS RIVER NEAR AVONDALE, CO.: 31 alluvial well(s) nearby; pooled water table -2.3 ft (1962–2023, no_trend, p=0.0505)

ARKANSAS RIVER AT NEPESTA BRIDGE NEAR NEPESTA, CO: 11 alluvial well(s) nearby; pooled water table -0.6 ft (1962–2023, increasing, p=0.0444)

ARKANSAS RIVER AT MOFFAT STREET AT PUEBLO, CO: 9 alluvial well(s) nearby; pooled water table +1.8 ft (1963–1999, no_trend, p=0.0699). Glover screen: 0.2 cfs of nearby metered alluvial pumping → est. lagged depletion 0.2–0.2 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

SALT CREEK NEAR MOUTH BELOW PUEBLO: 67 alluvial well(s) nearby; pooled water table -0.6 ft (1934–2023, no_trend, p=0.0591). Glover screen: 0.1 cfs of nearby metered alluvial pumping → est. lagged depletion 0.1–0.1 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.

14 reservoir(s) with 17,676 storage measurement(s), 1950–2026. Basin storage as of 2025-10-31 (the record's own end — reservoir records publish ~annually): 411 AF across 1 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
▸ PUEBLO RESERVOIR (1403526)	260,262	2018-01-23
▸ LAKE MEREDITH (1403525)	37,095	1997-10-31
▸ LAKE HENRY (1403524)	5,406	1997-10-31
▸ BEEMAN RESERVOIR (1403520)	1,096	1997-10-31
▸ DOTSON RESERVOIR (1403849)	1,020	2010-04-23
▸ HUERFANO VALLEY RES (1403821)	975	1997-04-01
▸ STONEWALL SPRINGS SOUTH RESERVOIR (1403593)	411	2025-10-31
▸ LAKE MINNEQUA (1503693)	400	2018-10-31

Decreed rights on this network run from 1861-04-01 to 2017-02-28. 2 abandonment screens and 13 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: 1609 across 1358 structure(s); 1065 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Abandonment radar (2 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 ~1965 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

HERMOSILLA DITCH (1400656) (1863-04-25, 8.0 cfs decreed): last active 1924 — 41 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1965) -- early absence of record is weak evidence of nonuse
MEADOWBROOK WELL "A" (1405129) (1967-10-15, 0.4 cfs decreed): last active 1949 — 16 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1965) -- early absence of record is weak evidence of nonuse

Compliance screens (13 advisory flags)

Screened 36 of 1358 structures with rights (42 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.

HUERFANO VALLEY DITCH (1400657): Observed p99 daily rate 95.7 cfs (max 1000.0) exceeds total decreed absolute 60.0 cfs across 32209 recorded day(s).
PBWW NORTHSIDE INTAKE (1400589): Observed p99 daily rate 69.6 cfs (max 597.6) exceeds total decreed absolute 25.5 cfs across 77277 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
1400782: Observed p99 daily rate 50.4 cfs (max 55.4) exceeds total decreed absolute 33.8 cfs across 2810 recorded day(s).
PBWW SOUTHSIDE INTAKE (1400590): Observed p99 daily rate 36.1 cfs (max 110.0) exceeds total decreed absolute 31.8 cfs across 47678 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
COMANCHE PUMP STATION (1400618): Observed p99 daily rate 30.4 cfs (max 87.2) exceeds total decreed absolute 19.9 cfs across 48164 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
1400591: Observed p99 daily rate 26.0 cfs (max 65.0) exceeds total decreed absolute 11.8 cfs across 30536 recorded day(s).
1400663: Observed p99 daily rate 23.7 cfs (max 45.1) exceeds total decreed absolute 1.5 cfs across 34985 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
SIX MILE ARROYO DITCH (1400553): Observed p99 daily rate 4.0 cfs (max 4.0) exceeds total decreed absolute 2.0 cfs across 4296 recorded day(s).
1400534: Observed p99 daily rate 2.9 cfs (max 3.6) exceeds total decreed absolute 2.9 cfs across 27918 recorded day(s). Structure holds an Augmentation-use decree -- diversions above the direct-flow decree can be lawful under plan operations; interpret with care.
HAVER DITCH EXTENSION (1400577): Observed p99 daily rate 2.5 cfs (max 2.5) exceeds total decreed absolute 1.5 cfs across 1654 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Conditional?
BESSEMER DITCH (1400533)	1861-04-01	22	392.7	—
1400713	1926-04-14	2	230.0	—
WELTON DITCH (1400661)	1861-04-15	3	131.2	—
EXCELSIOR DITCH (1400539)	1887-05-01	3	120.0	—
HUERFANO VALLEY DITCH (1400657)	1888-02-02	2	60.0	—
STONEWALL SPRINGS SOUTH RESERVOIR (1403593)	1887-05-01	3	60.0	yes
STONEWALL SPRINGS CENTRAL RESERVOIR (1403595)	1887-05-01	3	60.0	yes
STONEWALL SPRINGS EAST RESERVOIR (1403596)	1887-05-01	3	60.0	yes
1400782	1993-08-17	1	33.8	yes
PBWW SOUTHSIDE INTAKE (1400590)	1861-04-01	16	31.8	—
PUEBLO FISH HATCHERY PIPELINE (1400737)	1987-12-31	1	31.0	—
COLLIER DITCH (1400538)	1887-03-10	2	26.0	—
PBWW NORTHSIDE INTAKE (1400589)	1861-04-01	16	25.5	—
ELLIS DITCH (1400654)	1888-12-12	2	20.0	—
COMANCHE PUMP STATION (1400618)	1870-03-21	8	19.9	—

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	ARKANSAS RIVER NEAR AVONDALE, CO. (ARKAVOCO)	47.6	0.0	229.6	+229.6	0.9	Unaccounted +229.6 cfs gain over 0.9 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	EXCELSIOR RECHARGE POND (1400627A)	48.4	229.6	2.4	-227.2	0.8	Unaccounted -227.2 cfs loss over 0.8 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER AT NEPESTA BRIDGE NEAR NEPESTA, CO (ARKNEPCO)	66.3	0.0	93.1	+93.1	7.8	Unaccounted +93.1 cfs gain over 7.8 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	OXFORD FARMERS DITCH COMPANY (OXFDITCO)	66.4	93.1	18.5	-74.6	0.1	Unaccounted -74.6 cfs loss over 0.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER ABOVE OXFORD DITCH NEAR NEPESTA, CO (ARKOXFCO)	54.4	46.6	116.8	+70.2	0.2	Unaccounted +70.2 cfs gain over 0.2 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	BESSEMER DITCH (BESDITCO)	23.8	19.0	83.0	+64.1	10.3	Unaccounted +64.1 cfs gain over 10.3 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	COLORADO CANAL AT MILE 3.8 NEAR BOONE (COLCANCO)	58.5	59.7	0.0	-59.7	3.9	Unaccounted -59.7 cfs loss over 3.9 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ROCKY FORD HIGHLINE CANAL AT MILE 4.9 NEAR BOONE (RFHCANCO)	54.6	116.8	59.7	-57.0	0.3	Unaccounted -57.0 cfs loss over 0.3 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	STONEWALL SPRINGS SOUTH RESERVOIR OUTFLOW (1403593B)	46.5	53.5	0.0	-53.5	12.9	Unaccounted -53.5 cfs loss over 12.9 mi. Returns in this reach with stale data (COMANCHE RETURN FLOW) — over-reporting elsewhere is also possible.
MAINSTEM	HUERFANO RIVER NEAR BOONE, CO. (HUEBOOCO)	54.1	0.7	46.6	+45.9	4.4	Unaccounted +45.9 cfs gain over 4.4 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	COMANCHE PUMP STATION (1400618A)	25.5	51.1	9.1	-42.0	1.2	Unaccounted -42.0 cfs loss over 1.2 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	PUEBLO WASTEWATER PLANT (1400620A)	33.6	18.4	53.5	+35.0	0.0	Unaccounted +35.0 cfs gain over 0.0 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	PBWW PUEBLO DAM INLET (1400639A)	23.9	83.0	53.9	-29.1	0.1	Unaccounted -29.1 cfs loss over 0.1 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER TRIBUTARY ABOVE HWY 227 AT PUEBLO (ARK227CO)	33.6	39.9	16.4	-23.5	0.6	Unaccounted -23.5 cfs loss over 0.6 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	ARKANSAS RIVER AT MOFFAT STREET AT PUEBLO, CO (ARKMOFCO)	32.9	16.6	39.9	+23.3	0.2	Unaccounted +23.3 cfs gain over 0.2 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	HISTORIC ARKANSAS RIVERWALK PROJECT (HARP) OUTFALL (HARPOTCO)	32.8	0.2	16.6	+16.4	0.1	Unaccounted +16.4 cfs gain over 0.1 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	EXCELSIOR DITCH (1400539A)	32.1	0.0	10.0	+10.0	3.9	Unaccounted +10.0 cfs gain over 3.9 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
MAINSTEM	EXCELSIOR AUG STATION (1400625A)	32.6	10.0	0.2	-9.8	0.5	Unaccounted -9.8 cfs loss over 0.5 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
MAINSTEM	PBWW NORTHSIDE INTAKE (HIGH FLOW) (1400589A)	28.2	9.1	0.0	-9.1	2.7	Unaccounted -9.1 cfs loss over 2.7 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.

Gage ⇅	Station ⇅	Avg cfs Aug 10–Aug 16 ⇅	% Hist Median ⇅	Rank ⇅	Δ1wk ⇅	Δ4wk ⇅	Yrs ⇅	Status ⇅
ARKOXFCO	ARKANSAS RIVER ABOVE OXFORD DITCH NEAR NEPESTA, CO	116.8	19%	0	+23	-53	23.1	SHORT_RECORD
ARK227CO	ARKANSAS RIVER TRIBUTARY ABOVE HWY 227 AT PUEBLO	16.4	37%	0	-3	-9	21.7	SHORT_RECORD
BESDITCO	BESSEMER DITCH	83.0	49%	0	+1	-2	18.8	SHORT_RECORD
1400589A	PBWW NORTHSIDE INTAKE (HIGH FLOW)	0.0	0%	0	+0	+0	4.4	SHORT_RECORD
1400589B	PBWW NORTHSIDE INTAKE (LOW FLOW)	0.0	0%	0	+0	+0	4.4	SHORT_RECORD
1400639A	PBWW PUEBLO DAM INLET	53.9	91%	0	-7	-7	4.4	SHORT_RECORD
1413796A	EXCELSIOR RECHARGE POND 3 INFLOW	0.0	0%	0	+0	-0	4.5	SHORT_RECORD
HARPOTCO	HISTORIC ARKANSAS RIVERWALK PROJECT (HARP) OUTFALL	16.6	58%	0	-2	-10	3.9	SHORT_RECORD
1403593C	STONEWALL SPRINGS RESERVOIR INFLOW	0.0	0%	0	+0	+0	2.9	SHORT_RECORD
SALTMOCO	SALT CREEK NEAR MOUTH BELOW PUEBLO	53.5	95%	4	+17	+9	17.9	SHORT_RECORD
1400618A	COMANCHE PUMP STATION	9.1	64%	13	-1	+1	4.4	SHORT_RECORD
1400738A	PUEBLO FISH HATCHERY OUTFLOW	19.0	99%	48	-4	-4	4.3	SHORT_RECORD
WLTDITCO	WELTON DITCH	0.7	100%	50	-2	+0	5.0	SHORT_RECORD
HUEDYLCO	HUERFANO RIVER AT DOYLE BRIDGE, CO	3.3	109%	52	+0	+3	6.3	SHORT_RECORD
1400627A	EXCELSIOR RECHARGE POND	2.4	117%	54	+2	+2	4.5	SHORT_RECORD
1400625A	EXCELSIOR AUG STATION	0.2	121%	54	+0	+0	4.5	SHORT_RECORD
CUCHUECO	HUERFANO-CUCHARAS DITCH	1.3	487%	55	-0	+1	23.2	SHORT_RECORD
1400620A	PUEBLO WASTEWATER PLANT	18.4	102%	60	-0	+0	4.4	SHORT_RECORD
1403593B	STONEWALL SPRINGS SOUTH RESERVOIR OUTFLOW	8.2	0%	100	+4	+8	2.8	SHORT_RECORD
1400539A	EXCELSIOR DITCH	10.0	241%	100	+10	+10	4.5	SHORT_RECORD
ARKPUECO	ARKANSAS RIVER ABOVE PUEBLO	51.1	6%	0	+8	-171	60.8	OK
ARKMOFCO	ARKANSAS RIVER AT MOFFAT STREET AT PUEBLO, CO	39.9	5%	0	-12	-193	37.8	OK
ARKAVOCO	ARKANSAS RIVER NEAR AVONDALE, CO.	229.6	22%	0	+24	-133	73.8	OK
ARKNEPCO	ARKANSAS RIVER AT NEPESTA BRIDGE NEAR NEPESTA, CO	93.1	13%	0	+40	+10	90.8	OK
OXFDITCO	OXFORD FARMERS DITCH COMPANY	18.5	34%	0	-0	-2	39.6	OK
RFHCANCO	ROCKY FORD HIGHLINE CANAL AT MILE 4.9 NEAR BOONE	59.7	32%	0	-3	-45	37.2	OK
COLCANCO	COLORADO CANAL AT MILE 3.8 NEAR BOONE	0.0	0%	0	-20	-12	37.7	OK
HUEBOOCO	HUERFANO RIVER NEAR BOONE, CO.	46.6	873%	82	+26	+47	50.5	OK