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USBR LITTLE NAVAJO DIVR

Structure dossier · WDID 7704636 · PIPELINE · LITTLE NAVAJO RIVER · DWR record

Usbr Little Navajo Divr is a pipeline on Little Navajo River in Colorado. This page is its public record: the water it has a right to, whether it may take it today, and its history, compiled from the Colorado Division of Water Resources.

Source DWR administrative record · verify at DWR structure ↗ Source DWR administrative record · verify at DWR diversion records ↗ Source Our computation, scored against a reference · scored against DWR's call analysis, see /methods

Where this page's figures come from

Generated 2026-10-27 17:26 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260928 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (3876149) — every figure regenerates from this named code version and data image.

Who owns it

DWR’s own records name no owner for a ditch, reservoir or well, so this comes from the source shown and can be out of date. Organisations only: a private landowner’s name is never listed.

This is water crossing the divide

Usbr Little Navajo Divr is the source end of the Azotea Tunnel (San Juan-Chama Project) (tunnel). It takes water from Navajo, Little Navajo and Rio Blanco headwaters (Div 7) and delivers it to Rio Grande basin at Chama, New Mexico. Water leaving here is an export: it never reaches the rest of this basin.

Metered as a facility: AZOTUNNM, OSODIVCO, LOSODVCO, BLADIVCO — the record for the crossing itself, which may run longer than the record for either structure.

Owner / operator: USBR

From the site’s hand-curated register of transbasin facilities. Every crossing on one page →

Where this structure is measured

GageFlowing nowRecordHow we know
LITTLE OSO DIVERSION NEAR CHROMO LOSODVCO 0.0 cfs 1993–2026, 12,033 days DWR telemetry mapping
LITTLE NAVAJO RIV BEL L OSO DIV DAM, NR CHROMO, CO LITNACCO — 1971–1996, 9,254 days co-located, 13 m
LITTLE NAVAJO RIVER BELOW LITTLE OSO DIVERSION DAM LITOSOCO 129.0 cfs 1996–2026, 10,887 days co-located, 53 m

A green link is DWR's own: either its telemetry inventory maps this WDID to that station, or the station is named for this WDID (0700553 → 0700553A). An amber one is ours — the station sits within 250 m and shares a distinctive word with this structure's name, which is a strong hint rather than a DWR statement that this gage meters this structure. Wrong? Tell us.

Flowing now

0.0 cfs as of 2026-10-27 14:30 (2.9 h ago)

Zero is a real reading: the gage is reporting, and it says this structure is not diverting right now.

Provisional 15-minute telemetry from LOSODVCO ↗ (LITTLE OSO DIVERSION NEAR CHROMO). Raw, not the approved record — it is never merged into the diversion history below. DWR publishes the official diversion record after the water year closes and is approved, which is why that record ends months back while this reads minutes ago.

In short

In a median year over its last 15 recorded years it diverts 951 acre-feet.

Assembled from the figures on this page — every number above is checked against them before it is shown (2 checked). The detail, with its method, is in the cards below.

Download this structure

Everything on this page as data you can work with — and a README that makes it citable: the HydroBase snapshot it was built from, the build commit, what every column means, the method behind each derived figure, and that method's stated limits.

Log in to download the record Print / save as PDF

Downloads (the .zip and six CSV tables) need a free account — create one or log in. Everything in them is on this page.

Why the account? It is not a paywall and not a mailing list. Automated scrapers were requesting tens of thousands of these files a day, and each one rebuilds this whole record, which slowed the site for the people reading it. An account is the simplest way to keep downloads open to people and closed to bots.

What is in the bundle
  • rights.csv — every decreed right, most senior first, with admin numbers, dates, amounts, uses and case numbers.
  • annual_use.csv — recorded diversion by year, with releases accounted separately.
  • curtailment_now.csv — each right's current priority status and how often it was out across analog years.
  • court_cases.csv — the cases attached to its rights.
  • co_parties.csv — the other structures that were parties to those cases. Not available anywhere else.
  • call_climatology.csv — how often each right has been out of priority by week of season, with confidence intervals and the seasons the record could actually judge.
  • README.txt — provenance, methods, limits, disclaimer, and links back to DWR's own records for verification.

Where it sits

Location as DWR records it (diversion). Faint dots are the neighbouring water; click any to open it.

Which of its rights are out of priority?

The outlook for the weeks ahead is not computable for this structure: no decreed right on file, so there is no priority to test.

Recorded use (last 15 years on record)

Years far under the decreed amount? That gap has a name — paper water vs. wet water, explained on this structure.

In a median year this structure has a recorded diversion of 951 AF. Its most recent year on record, 2025, came in at 162 AF — 17% of that, and 1st lowest of the 15 years with a recorded volume.

YearDiverted (AFA volume: one acre covered a foot deep, about 326,000 gallons -- roughly a suburban household's outdoor use for a year.)Compared with its own recordDays recordedPeak (cfs)
2011 1,371 9th lowest of 15 · 144% of median 81 31.0
2012 1,401 11th lowest of 15 · 147% of median 39 28.0
2013 320 2nd lowest of 15 · 34% of median 122 19.0
2014 730 5th lowest of 15 · 77% of median 304 24.0
2015 1,377 10th lowest of 15 · 145% of median 122 31.0
2016 1,851 12th lowest of 15 · 195% of median 122 31.0
2017 5,930 15th lowest of 15 · 624% of median 122 89.0
2018 694 4th lowest of 15 · 73% of median 122 32.0
2019 5,569 14th lowest of 15 · 586% of median 365 81.0
2020 870 7th lowest of 15 · 92% of median 365 33.0
2021 842 6th lowest of 15 · 88% of median 365 19.0
2022 951 8th lowest of 15 · 100% of median 365 38.0
2023 4,041 13th lowest of 15 · 425% of median 365 82.1
2024 591 3rd lowest of 15 · 62% of median 366 25.1
2025 162 1st lowest of 15 · 17% of median 304 11.2

How good is our record of it?

Grade B (7/10 points) — the components below are the finding; the letter alone is not.

The rubric, component by component
CheckStateDetail
identity complete name, type, and water source all on file
decreed rights absent no water rights cached for this WDID
diversion record present 15484 measured days; currency unknown (no data-coverage date to compare against)
record continuity continuous 100% of the irrigation seasons in 1973-2025 carry measured days
published-record stability stable no upstream revisions recorded against this structure

Advisory reading aid on public data — not an administrative or legal conclusion, not a title opinion, and not a substitute for DWR administration or an engineer's analysis. Methodology review status is disclosed at hydrohistorian's basin pages.

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