Hydrohistorian
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Hydrohistorian

Colorado's water data. Find the connections between every ditch, well, reservoir and river gage in the state — and how each one connects to water law and administration. For water experts, and for everyone else.

New to water rights? Start here: what is paper water?

Every structure, gage and district in Colorado — 177,603 of them. Or browse the map below.

177,603 structures and 2,375 gages across 78 water districts · clicktap a district to open it

Know it by name? Browns Canyon The Numbers Bighorn Sheep Canyon Clear Creek Canyon Poudre Canyon Eagle River Roaring Fork Blue River

Division 1

WD1 — South Platte: Greeley to Balzac
51 stations · 1946 structures
Auto-mapped
WD2 — South Platte: Denver Gage to Greeley
Deployed basin: full weekly refresh, including EPA wastewater discharges.
Full analysis
WD3 — Cache La Poudre River
66 stations · 486 structures
Auto-mapped
WD4 — Big Thompson River
76 stations · 421 structures
Auto-mapped
WD5 — St. Vrain Creek
67 stations · 340 structures
Auto-mapped
WD6 — Boulder Creek
Deployed basin: validation deployment.
Full analysis
WD7 — Clear Creek
Deployed basin: full weekly refresh, every tab.
Full analysis
WD8 — South Platte Cheesman to Denver Gage
Covered by the South Platte deployment.
Full analysis
WD9 — Bear Creek
34 stations · 469 structures
Auto-mapped
WD23 — Upper South Platte
Covered by the South Platte deployment.
Full analysis
WD48 — Laramie River
6 stations · 61 structures
Auto-mapped
WD49 — Republican River
7 stations · 1249 structures
Auto-mapped
WD64 — South Platte: Balzac to Stateline
44 stations · 1500 structures
Auto-mapped
WD65 — Arikaree River
11 stations · 2501 structures
Auto-mapped
WD76 — Sand Creek
4 stations · 6 structures
Auto-mapped
WD80 — North Fork of South Platte
Covered by the South Platte deployment.
Full analysis

Division 2

WD10 — Fountain Creek
97 stations · 1104 structures
Auto-mapped
WD11 — Arkansas: Headwaters to Salida
66 stations · 629 structures
Auto-mapped
WD12 — Arkansas: Salida to Portland
22 stations · 594 structures
Auto-mapped
WD13 — Wet Mountain Valley
8 stations · 512 structures
Auto-mapped
WD14 — Arkansas: Portland to Fowler
38 stations · 976 structures
Auto-mapped
WD15 — Saint Charles
12 stations · 270 structures
Auto-mapped
WD16 — Cucharas River
14 stations · 273 structures
Auto-mapped
WD17 — Arkansas: Fowler to Las Animas
57 stations · 1287 structures
Auto-mapped
WD18 — Apishapa River
2 stations · 326 structures
Auto-mapped
WD19 — Purgatoire River
35 stations · 2798 structures
Auto-mapped
WD66 — Cimarron River Basin
0 stations · 0 structures
No DWR data
WD67 — Arkansas: Las Animas to Stateline
63 stations · 1269 structures
Auto-mapped
WD79 — Huerfano River
14 stations · 225 structures
Auto-mapped

Division 3

WD20 — Rio Grande
98 stations · 4169 structures
Auto-mapped
WD21 — Alamosa La Jara
23 stations · 273 structures
Auto-mapped
WD22 — Conejos Creek
35 stations · 314 structures
Auto-mapped
WD24 — Culebra Creek
22 stations · 174 structures
Auto-mapped
WD25 — San Luis Creek
20 stations · 305 structures
Auto-mapped
WD26 — Saguache Creek
6 stations · 426 structures
Auto-mapped
WD27 — Carnero Creek
2 stations · 833 structures
Auto-mapped
WD35 — Trinchera Creek
17 stations · 387 structures
Auto-mapped

Division 4

WD28 — Tomichi Creek
10 stations · 333 structures
Auto-mapped
WD40 — North Fork/Tribs.
115 stations · 935 structures
Auto-mapped
WD41 — Lower Uncompahgre River
35 stations · 76 structures
Auto-mapped
WD42 — Lower Gunnison River
10 stations · 78 structures
Auto-mapped
WD59 — East River Basin
36 stations · 329 structures
Auto-mapped
WD60 — San Miguel River Basin
25 stations · 306 structures
Auto-mapped
WD61 — Paradox Creek
6 stations · 32 structures
Auto-mapped
WD62 — Upper Gunnison River
21 stations · 216 structures
Auto-mapped
WD63 — Dolores River Basin
4 stations · 122 structures
Auto-mapped
WD68 — Upper Uncompahgre River
15 stations · 265 structures
Auto-mapped
WD73 — Little Dolores River
1 stations · 70 structures
Auto-mapped

Division 5

WD36 — Blue River Basin
47 stations · 1202 structures
Auto-mapped
WD37 — Eagle River Basin
42 stations · 1547 structures
Auto-mapped
WD38 — Roaring Fork River Basin
88 stations · 3759 structures
Auto-mapped
WD39 — Rifle/Elk/Parachute Creeks
23 stations · 1424 structures
Auto-mapped
WD45 — Divide Creek
16 stations · 1223 structures
Auto-mapped
WD50 — Muddy/Troublesome Creeks
12 stations · 343 structures
Auto-mapped
WD51 — Upper Colorado/Fraser Rivers
100 stations · 2004 structures
Auto-mapped
WD52 — Piney/Cottonwood Creeks
11 stations · 348 structures
Auto-mapped
WD53 — Tribs. North of Colorado River
12 stations · 831 structures
Auto-mapped
WD70 — Roan Creek Basin
6 stations · 187 structures
Auto-mapped
WD72 — Lower Colorado River
57 stations · 1670 structures
Auto-mapped

Division 6

WD43 — White River Basin
57 stations · 743 structures
Auto-mapped
WD44 — Lower Yampa River
31 stations · 583 structures
Auto-mapped
WD47 — North Platte River Basin
33 stations · 588 structures
Auto-mapped
WD54 — Slater/Timberlake Creeks
9 stations · 150 structures
Auto-mapped
WD55 — Little Snake River
6 stations · 43 structures
Auto-mapped
WD56 — Green River Basin
5 stations · 105 structures
Auto-mapped
WD57 — Middle Yampa River
12 stations · 190 structures
Auto-mapped
WD58 — Upper Yampa River
55 stations · 823 structures
Auto-mapped

Division 7

WD29 — San Juan River Basin
19 stations · 556 structures
Auto-mapped
WD30 — Animas River Basin
37 stations · 1192 structures
Auto-mapped
WD31 — Los Pinos River Basin
8 stations · 343 structures
Auto-mapped
WD32 — McElmo Creek Basin
18 stations · 255 structures
Auto-mapped
WD33 — La Plata River Basin
25 stations · 170 structures
Auto-mapped
WD34 — Mancos River Basin
19 stations · 165 structures
Auto-mapped
WD46 — Navajo Reservoir
0 stations · 0 structures
No DWR data
WD69 — Disappointment Creek Basin
2 stations · 30 structures
Auto-mapped
WD71 — West Dolores Creek/Tribs.
14 stations · 141 structures
Auto-mapped
WD77 — Navajo River Basin
11 stations · 130 structures
Auto-mapped
WD78 — Piedra River Basin
10 stations · 209 structures
Auto-mapped

What you get on a district page

Per basin
A longitudinal flow schematic, a date picker to reconstruct any historical day, trend & changepoint statistics per gage, and a legal view: seniority, compliance screens, and call-based stoppage explanations with links to court records.
My Water
Save your own WDIDs and each visit reports what changed for them: an active call senior to your rights, a new court case, a revision to your published record. Free account.
Groundwater
34,000 monitored wells and over a million water-level measurements back to 1883, with per-well trends, stream-corridor water-table histories, and each aquifer unit as its own head surface. Advisory — never a substitute for DWR administration.

Built from Colorado DWR's own records — HydroBase plus live REST, cross-checked against USGS. How this site is built, and what it cannot tell you →