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MANN LAKES RESERVOIR SYSTEM
Structure dossier · WDID 0203911 · RESERVOIR SYSTEM · SOUTH PLATTE RIVER · DWR record
Where this page's figures come from
Generated 2026-08-28 03:51 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (0576005) — 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.
Current administration
● Junior rights called out — call at LOWER LATHAM DITCH (SOUTH PLATTE RIVER, priority 1877-11-14).
● Junior rights called out — call at WESTERN MUTUAL DITCH (SOUTH PLATTE RIVER, priority 1871-08-09).
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 1863-05-15 — 127th most senior of the 21881 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: 0203373 (1863-05-15). Immediately behind: 0801251 (1863-08-30).
Decreed rights (24)
| 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 |
|---|---|---|---|---|---|---|---|
| 4883.0 | 1863-05-15 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 5083.0 | 1863-12-01 | 1883-04-28 | 0.0 | 0.0 | C | MUN | |
| 5205.0 | 1864-04-01 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 5600.0 | 1865-05-01 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 5965.0 | 1866-05-01 | 1883-04-28 | 0.0 | 0.0 | C | MUN | |
| 7739.0 | 1871-03-10 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 7975.0 | 1871-11-01 | 1883-04-28 | 0.0 | 0.0 | C | MUN | |
| 8659.0 | 1873-09-15 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 9686.0 | 1876-07-08 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 10901.0 | 1879-11-05 | 1883-04-28 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 11807.0 | 1882-04-29 | 1883-04-28 | 0.0 | 0.0 | C | MUN | |
| 13108.0 | 1885-11-20 | 1893-07-08 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 13393.0 | 1886-09-01 | 1893-07-08 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 13468.0 | 1886-11-15 | 1893-07-08 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 13772.0 | 1887-09-15 | 1893-07-08 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 23152.19981 | 1904-09-15 | 1918-05-18 | 0.0 | 0.0 | A | MUNAUGCUR | |
| 24974.15492 | 1892-05-31 | 1922-06-21 | 0.0 | 0.0 | A | MUNAUGCUR | |
| 24974.15587 | 1892-09-03 | 1922-06-21 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 25723.0 | 1920-06-05 | 1922-06-21 | 0.0 | 0.0 | A | MUNAUGCUR | |
| 26297.0 | 1921-12-31 | 1922-06-21 | 0.0 | 0.0 | C | MUNAUGCUR | |
| 60629.0 | 2015-12-30 | 2015-12-31 | 0.0 | 3741.0 | A | STOIRRMUNCOMINDRECFISFIRDOMSTK | |
| 60629.0 | 2015-12-30 | 2015-12-31 | 0.0 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMSTK | |
| 60630.60629 | 2015-12-30 | 2016-12-31 | 0.0 | 3741.0 | A | MUNAUG | |
| 61814.0 | 2019-03-29 | 2019-12-31 | 0.0 | 2306.0 | A | MUN |
Legal record & documents
55 decreed actions on record across
5 court cases:
19CW3061, 16CW3019, 15CW3177, 91CW0126, 08CW0205.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
19CW3061 | 1 | 2019-12-31 | S |
16CW3019 | 1 | 2016-12-31 | S |
15CW3177 | 51 | 2015-12-31 | O, S |
91CW0126 | 1 | 1991-12-31 | S |
08CW0205 | 1 | 1991-12-31 | S |
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 8 years on record)
In a median year this structure has a recorded diversion of 748 AF. Its most recent year on record, 2025, came in at 0 AF — 0% of that, and 1st lowest of the 8 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) |
|---|---|---|---|---|---|
| 2017 | 3,126 | 8th lowest of 8 · 418% of median | — | 149 | 35.6 |
| 2018 | 103 | 2nd lowest of 8 · 14% of median | — | 155 | 0.5 |
| 2019 | 128 | 3rd lowest of 8 · 17% of median | — | 149 | 0.9 |
| 2021 | 245 | 4th lowest of 8 · 33% of median | — | 27 | 6.5 |
| 2022 | 1,410 | 6th lowest of 8 · 188% of median | — | 156 | 12.2 |
| 2023 | 1,930 | 7th lowest of 8 · 258% of median | 116 | 365 | 19.4 |
| 2024 | 1,251 | 5th lowest of 8 · 167% of median | 2,194 | 366 | 18.3 |
| 2025 | 0 | 1st lowest of 8 · 0% of median | 1,675 | 304 | 0.0 |
Trends for this structure
Recorded use shows no clear trend over its last 8 recorded years — which is itself worth knowing.
How good is our record of it?
Grade A (9/10 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 | 24 right(s), seniority decoded |
| diversion record | present | 1671 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 92% of the irrigation seasons in 2017-2025 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.