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SHAMROCK DITCH

Structure dossier · WDID 1100658 · 1 · COTTONWOOD CREEK · DWR record

Where this page's figures come from

Generated 2026-08-27 21:27 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (2deb1d7) — 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: this structure is not on the modelled flow network, so no reference gage can honestly stand in for it.

Where it sits in line

Priority 1866-05-31 — 39th most senior of the 1489 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: PIONEER DITCH (BROWNS) (1866-05-17). Immediately behind: GORREL ALTERNATE DITCH (1866-05-31).

Decreed rights (2)

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
5995.01866-05-311890-06-19 0.00.0 CIRR 14
12105.01883-02-211890-06-19 1.00.0 CIRR 125

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 309 AF. Its most recent year on record, 2023, came in at 202 AF — 65% 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)
2008 320 9th lowest of 15 · 104% of median 197 2.3
2009 360 10th lowest of 15 · 116% of median 306 2.3
2010 241 4th lowest of 15 · 78% of median 116 2.3
2011 309 8th lowest of 15 · 100% of median 125 2.3
2012 246 5th lowest of 15 · 80% of median 114 2.3
2013 224 2nd lowest of 15 · 72% of median 114 2.3
2014 513 14th lowest of 15 · 166% of median 184 2.3
2015 228 3rd lowest of 15 · 74% of median 109 1.7
2016 288 7th lowest of 15 · 93% of median 100 2.3
2017 512 13th lowest of 15 · 166% of median 136 3.1
2018 434 12th lowest of 15 · 140% of median 161 2.3
2019 562 15th lowest of 15 · 182% of median 194 2.3
2020 360 10th lowest of 15 · 116% of median 166 2.3
2021 282 6th lowest of 15 · 91% of median 117 1.6
2023 202 1st lowest of 15 · 65% of median 198 1.6

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.