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BOULDER LEFT HAND DITCH

Structure dossier · WDID 0600513 · DITCH · BOULDER CREEK · DWR record

Where this page's figures come from

Generated 2026-08-27 20:59 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (96d5528) — every figure regenerates from this named code version and data image.

Where it sits

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

Which of its rights are out of priority?

Not computable for this structure: no administrative call record for this basin.

Where it sits in line

Priority 1862-06-01 — 53rd most senior of the 1867 structures with decreed rights in this water districtDWR's administrative subdivision of a river basin; the unit calls are usually stated in..

Under prior appropriationColorado's rule for sharing water: first in time, first in right. Age decides, not proximity or need., everything ahead of it in this line is satisfied in full before it receives any water. Immediately ahead: RURAL DITCH (1862-05-10). Immediately behind: BOULDER WHITE ROCK DITCH (1862-06-01).

On MAINSTEM at river mile 9.2, it is 7th of 78 down the reach. Immediately upstream: MESA RES. Immediately downstream: BOULDER WHITE ROCK DITCH.

Position on the modelled network, not a claim about whose water this is — a stream carries water from many rights at once, and diverted water returns to it.

Decreed rights (3)

Admin noDWR's numeric encoding of a water right's seniority. Smaller is more senior; the integer part counts days from 1849-12-31 to the date that ranks the right. AppropriatedWhen water was first put to beneficial use. It sets seniority unless a prior adjudication date is later. AdjudicatedWhen the water court confirmed the right. A use decreed in 1975 was not a decreed use in 1955, however old the appropriation is. AbsoluteA right actually put to use, as opposed to conditional -- a placeholder for a use not yet made. ConditionalA right reserving a place in line for a use not yet made; it must be diligently pursued or it lapses. UnitsUsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on.Case
4535.01862-06-011882-06-02 1.70.0 CIRR
8736.01873-12-011882-06-02 82.80.0 CIRR
35731.01947-10-301953-09-28 50.00.0 CSTO

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 2,276 AF. Its most recent year on record, 2025, came in at 3,489 AF — 153% of that, and 14th 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)
2010 1,298 4th lowest of 15 · 57% of median 154 15.3
2011 2,555 11th lowest of 15 · 112% of median 177 20.0
2012 706 2nd lowest of 15 · 31% of median 158 20.6
2013 1,484 5th lowest of 15 · 65% of median 114 25.7
2014 2,375 10th lowest of 15 · 104% of median 132 21.6
2015 1,141 3rd lowest of 15 · 50% of median 139 14.0
2016 1,944 7th lowest of 15 · 85% of median 161 23.5
2017 2,276 8th lowest of 15 · 100% of median 181 25.0
2018 1,602 6th lowest of 15 · 70% of median 154 18.7
2019 3,137 12th lowest of 15 · 138% of median 180 23.9
2020 4,494 15th lowest of 15 · 198% of median 145 26.7
2021 415 1st lowest of 15 · 18% of median 53 5.0
2023 2,319 9th lowest of 15 · 102% of median 163 11.9
2024 3,324 13th lowest of 15 · 146% of median 141 18.9
2025 3,489 14th lowest of 15 · 153% of median 179 19.6

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.