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TANI LAKES COMBINED

Structure dossier · WDID 0203700 · RESERVOIR SYSTEM · SOUTH PLATTE RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 21:26 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 1861-11-01 — 49th 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: WEST GRAVEL LAKES COMBINED (1861-11-01). Immediately behind: 0203705 (1861-11-01).

Decreed rights (12)

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
4323.01861-11-011884-10-04 0.00.0 AMUN
4323.01861-11-011884-10-04 0.00.0 CMUN
5057.01863-11-051884-10-04 0.00.0 CMUN
5205.01864-04-011883-04-28 0.00.0 CIRRMUNCOMINDRECFISFIRDOMAUGWLD
6273.01867-03-051884-10-04 0.00.0 CMUN
8861.01874-04-051884-10-04 0.00.0 CMUN
13108.01885-11-201893-07-08 0.00.0 CIRRMUNCOMINDRECFISFIRDOMAUGWLD
13393.01886-09-011893-07-08 0.00.0 CIRRMUNCOMINDRECFISFIRDOMAUGWLD
13468.01886-11-151893-07-08 0.00.0 CIRRMUNCOMINDRECFISFIRDOMAUGWLD
13772.01887-09-151893-07-08 0.00.0 CIRRMUNCOMINDRECFISFIRDOMAUGWLD
47116.463681976-12-131979-12-31 3927.564072.44 AIRRMUNCOMINDRECFISFIRDOMOTH
51216.01990-03-231990-12-31 0.04000.0 AIRRMUNCOMINDRECFISFIRDOMAUGOTH

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 9,426 AF. Its most recent year on record, 2025, came in at 17,296 AF — 184% of that, and 14th 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.

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 recordReleased (AF)Days recordedPeak (cfs)
2010 17,853 15th lowest of 15 · 189% of median 451 232 106.0
2012 555 1st lowest of 15 · 6% of median 89 61 21.8
2013 9,426 8th lowest of 15 · 100% of median 8,499 365 133.8
2014 4,829 5th lowest of 15 · 51% of median 6,350 365 99.4
2015 7,513 7th lowest of 15 · 80% of median 8,160 365 180.8
2016 15,997 13th lowest of 15 · 170% of median 8,316 361 139.8
2017 12,217 9th lowest of 15 · 130% of median 13,007 365 124.2
2018 12,855 11th lowest of 15 · 136% of median 10,370 365 141.1
2019 5,373 6th lowest of 15 · 57% of median 11,945 365 34.5
2020 2,453 4th lowest of 15 · 26% of median 14,301 366 35.8
2021 1,497 2nd lowest of 15 · 16% of median 11,145 365 60.0
2022 2,099 3rd lowest of 15 · 22% of median 12,673 365 41.1
2023 12,661 10th lowest of 15 · 134% of median 9,925 365 215.2
2024 14,480 12th lowest of 15 · 154% of median 12,066 366 110.7
2025 17,296 14th lowest of 15 · 184% of median 12,602 304 163.3

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.