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POSTERARO DITCH

Structure dossier · WDID 1100554 · 1 · SOUTH ARKANSAS RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 21:12 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 1867-05-01 — 48th 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: PINON DITCH (1867-05-01). Immediately behind: PIKE DITCH (1867-05-31).

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
6330.01867-05-011890-06-19 0.640.0 CIRR 17
8552.01873-05-311890-06-19 1.00.0 CIRR 46

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 530 AF. Its most recent year on record, 2023, came in at 314 AF — 59% 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 570 11th lowest of 15 · 108% of median 183 1.6
2009 585 14th lowest of 15 · 110% of median 194 1.6
2010 530 8th lowest of 15 · 100% of median 177 1.6
2011 540 9th lowest of 15 · 102% of median 171 1.6
2012 554 10th lowest of 15 · 104% of median 176 1.7
2013 600 15th lowest of 15 · 113% of median 191 1.6
2014 460 7th lowest of 15 · 87% of median 192 1.6
2015 450 6th lowest of 15 · 85% of median 171 1.6
2016 424 3rd lowest of 15 · 80% of median 147 1.6
2017 444 5th lowest of 15 · 84% of median 168 1.6
2018 442 4th lowest of 15 · 83% of median 197 1.6
2019 362 2nd lowest of 15 · 68% of median 153 1.6
2020 574 12th lowest of 15 · 108% of median 204 1.6
2021 578 13th lowest of 15 · 109% of median 198 2.5
2023 314 1st lowest of 15 · 59% of median 101 1.9

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.