MCCARTNEY SEEP DITCH ☆ My Water

Where this structure is measured

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.

In short

MCCARTNEY SEEP DITCH holds 4 decreed rights on TARRYALL CREEK. As of 2026-10-01, 4 of them are out of priority under a call at admin 5112.00000 placed by SOUTH PLATTE RIVER AT WATERTON. 7 further calls state no district and sit outside this one, so they are counted here rather than assumed either way. In a median year over its last 15 recorded years it diverts 651 acre-feet. It was a party to 1 court cases that also touched 4 other structures.

Assembled from the figures on this page — every number above is checked against them before it is shown (9 checked). The detail, with its method, is in the cards below.

Current administration

● Fully called out — call at SOUTH PLATTE RIVER AT WATERTON (SOUTH PLATTE RIVER, priority 1863-12-30).

Which of its rights are out of priority?

Under today's controlling call (SOUTH PLATTE RIVER AT WATERTON, priority 1863-12-30): 4 of this structure's 4 rights are out of priority now. (7 call(s) state no district and sit outside this one — not judged, not assumed.) In the 5 past years most like this one (2025, 2021, 2024, 2020, 2023), 4 of the rights shown below were out at least one week in at least one analog year.

Where it sits in line

Priority 1885-05-20 — 702nd most senior of the 21886 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: WRIGHT DITCH (1885-05-01)☆. Immediately behind: LINK DITCH (1885-05-20)☆.

On TARRYALL CREEK at river mile -17.0, it is 26th of 123 down the reach. Immediately upstream: PACKER DITCH☆. Immediately downstream: HUGHES SUPP WASTE W D☆.

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 (4)

Amounts marked cfs are flow rates; AF are stored volumes (storage rights are decreed in acre-feet). An absolute amount of 0.0 beside an alt-point amount is not a dead right: the water is decreed at another structure, and that row records permission to divert it here instead (an alternate point or exchange). A case listing several numbers reflects the original decree plus later change cases.

How much of this decree was in priority, by day

A right is in priority on a day when it is senior to every call administering this structure. Of its 58.6 cfs decreed rate, the average day over the last 6 year(s) had 13.884 cfs in priority (24% of the decree). No call in effect is a free river — that was 6.4% of days.

On 1293 days some rights were in priority and others were not — seniority splits a decree rather than switching it off. Calls are set and released at a time of day, not at midnight, so a day is counted by the hour: a call setting at 4pm costs that day a third of its rate, not all of it. A call began or ended mid-day on 32 of these days.

This is paper water. It is the decreed rate that was in priority — not water that was physically in the stream, and not water this structure diverted. A ditch can be in priority for 50 cfs on a day the creek carries five. What that distinction means →

Legal record & documents

10 decreed actions on record across 6 court cases: 19CW3052, 96CW0235, CA1777, CA0341, 88CW0263, 02CW0240A.

82 imaged documents on DWR’s shelf for this structure — 66 water-court documents across 6 cases, including 6 decrees. Every row opens the scanned PDF at DWR. Listing as of 2026-09-17.

Imaged documents at DWR. DWR keeps the scanned documents for this structure — decrees, rulings, plats, correspondence — in its Laserfiche archive. Open the list directly: imaged documents for 2300889 ↗ (indexed by structure, not by case — the cases listed above appear within the list).

Other DWR records for this structure: DWR’s page for this structure ↗ — net amounts, water rights, transactions & adjudication history, and diversion records, all on that one page. On this site: the district’s full legal picture →

How often is it out of priority?

Across the 11 seasons whose call record is complete enough to judge this structure (2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026), week by week from April.

Structures it shares court cases with

This structure was a party to 1 court case that also touched 4 other structures — changes of water right, augmentation plans, exchanges. Being parties to the same case does not by itself mean water moved between them; which way it ran, and how much, is in the decree.

Also a party to 3 omnibus adjudications (CA0341, 217 structures; CA1777, 34 structures; 88CW0263, 25 structures). Those settled many rights at once and are listed separately: they say these structures were adjudicated together, not that they deal with each other.

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 651 AF. Its most recent year on record, 2006, came in at 63 AF — 10% of that, and 1st lowest of the 15 years with a recorded volume.

Trends for this structure

Recorded use shows no clear trend over its last 15 recorded years — which is itself worth knowing.

Its reference gage, Tarryall Creek at US 285 near Como: no clear flow trend.

Every gage and reach in this district →

How good is our record of it?

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