State · United States · USGS · BOR · USACE · CDEC

Wyoming

37.7% average fill

Measured

Data pending

Volume stored

3,761 hm³

Measured capacity

9,974 hm³

Critical

Low level

Below month average

12 of 26

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Drought Monitor · 20 October 2026

Weekly map · area in each category

Drought status

85.6%

of the area in drought (D1 or worse)

Worst category: D3 extreme drought

down 1.8 points on the week

D0 14.4%D1 33.6%D2 33.4%D3 18.6%D4 0%

Severe or worse (D2+)

52.0%

Extreme or worse (D3+)

18.6%

DSCI

2560–500

People in drought

503,000

Reservoirs (reservoirs.earth)

37.7% full26 tracked

Reservoirs on drought ground

24 of 2721 in D2 or worse

As of the 20 October 2026 U.S. Drought Monitor map, 85.6% of Wyoming was in drought (D1 or worse), with 18.6% in extreme or exceptional drought (D3–D4). The 26 reservoirs we track in Wyoming were 37.7% full on their latest readings. 24 of 27 tracked reservoir sites sit inside the drought area, 21 of them in severe drought (D2) or worse.

The Drought Monitor maps where conditions are dry this week — rainfall, soil moisture, streamflow — not how much water is stored. Reservoir storage lags it by months, so a region can be in drought with full reservoirs, or out of drought with empty ones. Source: droughtmonitor.unl.edu. The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.

Reservoirs

Sorted by capacity

Seminoe Reservoir

low

21.7%273 hm³View →

Updated 2026-10-27· 48% of month avg· D2

Pathfinder Reservoir

critical

18.9%237 hm³View →

Updated 2026-10-27· 45% of month avg· D2

Jackson Lake

critical

9.3%97 hm³View →

Updated 2026-10-27· 19% of month avg· D0

Boysen Dam & Reservoir

74.4%644 hm³View →

Updated 2026-10-27· 90% of month avg· D3

Boysen Reservoir

74.7%646 hm³View →

Updated 2026-10-27· 90% of month avg· D3

Buffalo Bill Reservoir

60.5%482 hm³View →

Updated 2026-10-27· 97% of month avg· D2

South Fork Dike at Buffalo Bill Reservoir

critical

0.4%3 hm³View →

Updated 2026-10-27· 100% of month avg· D2

Glendo Dam & Reservoir

low

37.0%208 hm³View →

Updated 2026-10-27· 119% of month avg· D1

Glendo Reservoir

low

37.2%209 hm³View →

Updated 2026-10-27· 118% of month avg· D1

Fontenelle Reservoir

83.6%345 hm³View →

Updated 2026-10-26· 111% of month avg· D2

Keyhole Dam & Reservoir

low

24.3%100 hm³View →

Updated 2026-10-27· 73% of month avg· D3

Keyhole Reservoir

low

24.3%100 hm³View →

Updated 2026-10-27· 73% of month avg· D3

Alcova Reservoir

87.9%200 hm³View →

Updated 2026-10-27· 96% of month avg· D2

Bull Lake Reservoir

49.0%92 hm³View →

Updated 2026-10-27· 134% of month avg· D2

Guernsey Reservoir

critical

15.0%8 hm³View →

Updated 2026-10-27· 120% of month avg· D1

Big Sandy Reservoir

low

21.7%11 hm³View →

Updated 2026-10-26· 52% of month avg· D2

Pilot Butte Reservoir

83.4%35 hm³View →

Updated 2026-10-27· 117% of month avg· D2

Pilot Butte Reservoir

83.3%35 hm³View →

Updated 2026-10-27· 115% of month avg· D2

Meeks Cabin Reservoir

low

21.0%8 hm³View →

Updated 2026-10-26· 120% of month avg· D0

Anchor Reservoir

critical

5.0%1 hm³View →

Updated 2026-10-27· 114% of month avg· D3

Anchor Reservoir

critical

5.0%1 hm³View →

Updated 2026-10-27· 116% of month avg· D3

Grassy Lake

45.8%9 hm³View →

Updated 2026-10-27· 73% of month avg· D0

Eden Reservoir

low

20.2%4 hm³View →

Updated 2026-10-26· 67% of month avg· D2

Kortes Dam & Reservoir

99.5%6 hm³View →

Updated 2026-10-27· 100% of month avg· D2

Kortes Reservoir

99.5%6 hm³View →

Updated 2026-10-26· 100% of month avg· D2

Gray Reef Reservoir

82.1%2 hm³View →

Updated 2026-10-26· 104% of month avg· D2

Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC) and, in Texas, the Texas Water Development Board. Fill % uses design capacity from the National Inventory of Dams where available; Water Data for Texas lakes use that board's conservation capacity; a few sites without a match fall back to the 5-year maximum. "% of month avg" compares the current fill with the reservoir’s own average for this calendar month over its readings on record. D0–D4 is the U.S. Drought Monitor category of the ground at the reservoir’s coordinates on the latest weekly map — local conditions, not storage.

Major reservoirs — data pending

⏳

Seminoe Dam & Reservoir — data sourcing in progress

Storage is monitored by the US Army Corps of Engineers (USACE CWMS), but the live feed is currently stale — we are working to restore it. Known capacities: Seminoe Dam & Reservoir (1.3 km³).

Seminoe Dam & Reservoir

Sourcing

Capacity: 1,255 hm³⏳ Pending

About reservoirs in Wyoming

As of October 27, 2026, the reservoirs we track across Wyoming that report live levels hold roughly 3,761 hm³ of water — about 37.7% of their combined capacity. Taken together, Wyoming's reservoirs are low.

Across the region, 6 reservoirs are at critically low levels and 8 are low. Kortes Dam & Reservoir is the fullest at 99.5%, while South Fork Dike at Buffalo Bill Reservoir is the lowest at 0.4%.

Over the most recent week on record, 7 reservoirs rose and 1 reservoir fell across Wyoming.

Storage figures for Wyoming come from USGS · USACE · BOR · CDEC; the most recent reading is from October 27, 2026. Each reservoir below links to its own page with full history and seasonal context.

Wyoming at a glance

Reservoirs tracked: 26
Average fill: 37.7%
Water stored: 3,761 hm³
Combined capacity: 9,974 hm³
At critically low levels: 6
Fullest: Kortes Dam & Reservoir (99.5%)
Lowest: South Fork Dike at Buffalo Bill Reservoir (0.4%)
Last updated: October 27, 2026

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