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TERRACE RESERVOIR
Structure dossier · WDID 2103583 · 3 · ALAMOSA RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 23:32 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 1870-04-10 — 15th most senior of the 1041 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: VALDEZ D BYPASS (1870-04-10). Immediately behind: CAPULIN D (1870-04-12).
Decreed rights (4)
| 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. | Units | UsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on. | Case |
|---|---|---|---|---|---|---|---|
| 7405.0 | 1870-04-10 | 1888-07-11 | 0.45 | 0.0 | C | STOMIN | 9 |
| 7410.0 | 1870-04-15 | 1888-07-11 | 56.5 | 0.0 | A | STOIRRMUNCOMINDRECFISDOMSTKAUG | 11 |
| 7410.0 | 1870-04-15 | 1888-07-11 | 3.0 | 0.0 | C | STOIRRMUNCOMINDRECFISDOMSTKAUG | 11 |
| 19957.0 | 1904-08-22 | 1918-02-07 | 17171.0 | 0.0 | A | IRR | 110 |
Legal record & documents
8 decreed actions on record across
6 court cases:
02/07/1918, 82CW0097, 16CW3019, 14CW3027, 13CW3014, 13CW3013.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
02/07/1918 | 1 | 1918-02-07 | S |
82CW0097 | 1 | 1888-07-11 | O |
16CW3019 | 2 | 1888-07-11 | O |
14CW3027 | 2 | 1888-07-11 | O |
13CW3014 | 1 | 1888-07-11 | O |
13CW3013 | 1 | 1888-07-11 | O |
DWR's own records for this structure: net amounts · transactions & adjudication history · scanned decrees (search a case number there for the imaged document). On this site: the district's full legal picture →
Recorded use (last 14 years on record)
In a median year this structure has a recorded diversion of 6,138 AF. Its most recent year on record, 2025, came in at 6,033 AF — 98% of that, and 7th lowest of the 14 years with a recorded volume.
This structure records both diversions and reservoir releases — they are separate water movements and are accounted separately below.
| Year | Diverted (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 record | Released (AF) | Days recorded | Peak (cfs) |
|---|---|---|---|---|---|
| 1950 | 3,412 | 4th lowest of 14 · 56% of median | — | 114 | 40.0 |
| 2013 | 2,417 | 1st lowest of 14 · 39% of median | — | 61 | 37.8 |
| 2014 | 2,710 | 2nd lowest of 14 · 44% of median | 5,860 | 178 | 25.2 |
| 2015 | 2,746 | 3rd lowest of 14 · 45% of median | 3,862 | 191 | 26.1 |
| 2016 | 7,242 | 9th lowest of 14 · 118% of median | 6,902 | 366 | 46.3 |
| 2017 | 12,726 | 13th lowest of 14 · 207% of median | 8,907 | 365 | 148.8 |
| 2018 | 5,730 | 5th lowest of 14 · 93% of median | 9,415 | 365 | 36.7 |
| 2019 | 13,334 | 14th lowest of 14 · 217% of median | 9,715 | 365 | 473.6 |
| 2020 | 11,749 | 12th lowest of 14 · 191% of median | 10,317 | 366 | 37.2 |
| 2021 | 5,877 | 6th lowest of 14 · 96% of median | 6,168 | 365 | 52.8 |
| 2022 | 7,371 | 10th lowest of 14 · 120% of median | 5,355 | 365 | 59.8 |
| 2023 | 11,464 | 11th lowest of 14 · 187% of median | 13,057 | 365 | 224.9 |
| 2024 | 6,243 | 8th lowest of 14 · 102% of median | 6,358 | 366 | 32.2 |
| 2025 | 6,033 | 7th lowest of 14 · 98% of median | 6,354 | 304 | 262.8 |
Trends for this structure
Recorded use shows no clear trend over its last 14 recorded years — which is itself worth knowing.
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
| Check | State | Detail |
|---|---|---|
| identity | complete | name, type, and water source all on file |
| decreed rights | on file | 4 right(s), seniority decoded |
| diversion record | present | 4136 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 26% of the irrigation seasons in 1950-2025 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.