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SOUTH FORK MASON DITCH

Structure dossier · WDID 5300802 · 1 · MASON CREEK · DWR record

Where this page's figures come from

Generated 2026-08-27 23:12 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (a1c9146) — 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 1903-10-10 — 167th most senior of the 1231 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: JOLLY HOMESTEAD NO 2 D (1903-09-28). Immediately behind: HENRY NO 2 DITCH (1904-05-15).

Decreed rights (1)

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
20427.19641903-10-101907-12-09 0.80.0 CIRR 195

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 81 AF. Its most recent year on record, 2018, came in at 8 AF — 10% 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)
1997 117 14th lowest of 15 · 144% of median 65 1.0
1998 130 15th lowest of 15 · 160% of median 61 1.2
1999 98 12th lowest of 15 · 121% of median 67 0.8
2000 40 3rd lowest of 15 · 49% of median 41 0.5
2001 39 2nd lowest of 15 · 48% of median 64 0.5
2005 57 5th lowest of 15 · 70% of median 58 0.5
2006 75 7th lowest of 15 · 93% of median 77 0.5
2007 81 8th lowest of 15 · 100% of median 83 0.5
2008 90 11th lowest of 15 · 111% of median 92 0.5
2009 84 10th lowest of 15 · 104% of median 74 0.8
2010 81 8th lowest of 15 · 100% of median 83 0.5
2011 108 13th lowest of 15 · 133% of median 78 0.8
2012 52 4th lowest of 15 · 64% of median 64 0.5
2013 63 6th lowest of 15 · 78% of median 65 0.5
2018 8 1st lowest of 15 · 10% of median 22 0.2

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 on file 1 right(s), seniority decoded
diversion record present 1806 measured days; currency unknown (no data-coverage date to compare against)
record continuity sparse 20% of the irrigation seasons in 1975-2018 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.