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JEFFERSON LAKE RES
Structure dossier · WDID 2303981 · RESERVOIR · JEFFERSON LAKE FORK · 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 (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
● Fully called out — call at LAST CHANCE DITCH 2 (SOUTH PLATTE RIVER, priority 1863-12-30).
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 1874-10-01 — 462nd 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: 2303977 (1874-10-01). Immediately behind: 2300963 (1874-10-14).
Decreed rights (26)
| 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 |
|---|---|---|---|---|---|---|---|
| 9040.0 | 1874-10-01 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 9053.0 | 1874-10-14 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 9266.0 | 1875-05-15 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 9283.0 | 1875-06-01 | 1889-10-18 | 0.69 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGWLD | |
| 10722.0 | 1879-05-10 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 10732.0 | 1879-05-20 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 10763.0 | 1879-06-20 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 10836.0 | 1879-09-01 | 1889-10-18 | 2.2 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGWLD | |
| 11032.0 | 1880-03-15 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 11129.0 | 1880-06-20 | 1889-10-18 | 0.0 | 0.0 | C | MUNALL | |
| 11170.0 | 1880-07-31 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 11263.0 | 1880-11-01 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 11453.0 | 1881-05-10 | 1889-10-18 | 1.03 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGPWR | |
| 11458.0 | 1881-05-15 | 1889-10-18 | 0.38 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGWLD | |
| 11809.0 | 1882-05-01 | 1889-10-18 | 0.0 | 0.0 | C | MUNALL | |
| 11813.0 | 1882-05-05 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 11854.0 | 1882-06-15 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 12205.0 | 1883-06-01 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 12924.0 | 1885-05-20 | 1889-10-18 | 0.0 | 0.0 | C | MUNALL | |
| 13964.0 | 1888-03-25 | 1889-10-18 | 0.0 | 0.0 | C | MUNAUGALL | |
| 14536.12936 | 1885-06-01 | 1913-05-22 | 0.0 | 0.0 | C | MUNALL | |
| 14536.14056 | 1888-06-25 | 1913-05-22 | 4200.0 | 0.0 | A | IRR | |
| 14536.14427 | 1889-07-01 | 1896-05-28 | 0.0 | 0.0 | C | MUNALL | |
| 16718.0 | 1895-10-09 | 1913-05-22 | 0.0 | 0.0 | C | MUNALL | |
| 28685.0 | 1928-07-15 | 1953-03-24 | 372.536 | 1589.964 | A | IRR | |
| 29219.0 | 1929-12-31 | 1953-03-24 | 3552.464 | 0.0 | A | IRR |
Legal record & documents
41 decreed actions on record across
10 court cases:
CA3286, CA1678, 88CW0263, 88CW0262, W7936, 93CW0140, 92CW0156, 88CW0228, 86CW0223, 86CW0222.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA3286 | 3 | 1953-03-24 | S |
CA1678 | 1 | 1913-05-22 | S |
88CW0263 | 4 | 1913-05-22 | O, S |
88CW0262 | 3 | 1913-05-22 | O, S |
W7936 | 13 | 1889-10-18 | O |
93CW0140 | 1 | 1889-10-18 | O |
92CW0156 | 8 | 1889-10-18 | O |
88CW0228 | 2 | 1889-10-18 | O |
86CW0223 | 4 | 1889-10-18 | O |
86CW0222 | 2 | 1889-10-18 | 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 15 years on record)
In a median year this structure has a recorded diversion of 3,317 AF. Its most recent year on record, 2024, came in at 5,296 AF — 160% of that, and 15th lowest of the 15 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) |
|---|---|---|---|---|---|
| 2010 | 1,810 | 2nd lowest of 15 · 55% of median | 2,664 | 288 | 23.1 |
| 2011 | 3,343 | 9th lowest of 15 · 101% of median | 3,759 | 294 | 37.3 |
| 2012 | 392 | 1st lowest of 15 · 12% of median | 2,623 | 164 | 2.3 |
| 2013 | 2,626 | 4th lowest of 15 · 79% of median | 165 | 316 | 22.6 |
| 2014 | 3,247 | 7th lowest of 15 · 98% of median | 1,085 | 345 | 46.4 |
| 2015 | 3,317 | 8th lowest of 15 · 100% of median | 1,968 | 357 | 30.5 |
| 2016 | 4,381 | 14th lowest of 15 · 132% of median | 2,128 | 316 | 32.6 |
| 2017 | 3,054 | 6th lowest of 15 · 92% of median | 1,103 | 360 | 32.9 |
| 2018 | 2,166 | 3rd lowest of 15 · 65% of median | 444 | 364 | 15.6 |
| 2019 | 3,523 | 13th lowest of 15 · 106% of median | 2,695 | 331 | 35.9 |
| 2020 | 3,400 | 11th lowest of 15 · 102% of median | 316 | 359 | 83.3 |
| 2021 | 3,522 | 12th lowest of 15 · 106% of median | 795 | 365 | 20.3 |
| 2022 | 2,840 | 5th lowest of 15 · 86% of median | 794 | 346 | 16.6 |
| 2023 | 3,388 | 10th lowest of 15 · 102% of median | 1,395 | 353 | 18.2 |
| 2024 | 5,296 | 15th lowest of 15 · 160% of median | 496 | 305 | 63.5 |
Trends for this structure
Recorded use is rising over its last 15 recorded years (+112 AF/yr, Mann-Kendall p=0.048).
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 | 26 right(s), seniority decoded |
| diversion record | present | 9027 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 89% of the irrigation seasons in 1977-2024 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.