Reservoir Watch
Official storage levels across 643 reservoirs in 39 states. Data from the US Bureau of Reclamation.
Average fill
56.8%
Total volume
216.9 km³
Reservoirs
643
Critical
94
Low level
96
Fill by state
Hover for details · USBR coverageLoading map…
US at a glance
National average fill
56.8%
216,852 of 381,776 hm³ stored
Reservoirs
643
States
39
Total capacity
381.8 km³
Volume stored
216.9 km³
Critical
94
Low level
96
Coverage: USBR (Bureau of Reclamation) reservoirs — primarily 17 western states. Eastern US reservoirs managed by USACE are not yet included. Last reading: 2026-10-14.
Drought vs storage
U.S. Drought Monitor · weeklyDrought Monitor · 6 October 2026
Weekly map · area in each categoryDrought status
46.3%
of the area in drought (D1 or worse)
Worst category: D4 exceptional drought
down 3.5 points on the week
Severe or worse (D2+)
26.3%
Extreme or worse (D3+)
8.3%
DSCI
1460–500
People in drought
101.9 million
Reservoirs (reservoirs.earth)
56.8% full643 tracked
Reservoirs on drought ground
306 of 573201 in D2 or worse
As of the 6 October 2026 U.S. Drought Monitor map, 46.3% of the United States was in drought (D1 or worse), with 8.3% in extreme or exceptional drought (D3–D4). Across the Lower 48 alone the figure was 55.2%. The 643 reservoirs we track in the United States were 56.8% full on their latest readings. 306 of 573 tracked reservoir sites sit inside the drought area, 201 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.
National fill — multi-year
By state
Sorted by capacityTexas
121 reservoirs
Average fill
68.4%
Drought status: 82.0% of area · worst D4
Utah
27 reservoirs
Average fill
29.0%
Drought status: 100% of area · worst D3
Nevada
7 reservoirs
Average fill
26.8%
Drought status: 95.8% of area · worst D3
Montana
24 reservoirs
Average fill
79.7%
Drought status: 25.7% of area · worst D3
California
33 reservoirs
Average fill
58.7%
Drought status: 23.3% of area · worst D1
South Dakota
14 reservoirs
Average fill
75.9%
Drought status: 61.3% of area · worst D2
North Dakota
11 reservoirs
Average fill
74.9%
Drought status: 53.3% of area · worst D3
Oklahoma
48 reservoirs
Average fill
64.5%
Drought status: 96.7% of area · worst D4
Kentucky
17 reservoirs
Average fill
53.9%
Drought status: 14.6% of area · worst D1
Wyoming
25 reservoirs
Average fill
36.4%
Drought status: 88.9% of area · worst D3
Missouri
10 reservoirs
Average fill
36.8%
Drought status: 44.8% of area · worst D3
Kansas
34 reservoirs
Average fill
67.5%
Drought status: 30.9% of area · worst D2
Louisiana
3 reservoirs
Average fill
66.3%
Drought status: 79.1% of area · worst D3
Idaho
20 reservoirs
Average fill
23.1%
Drought status: 67.6% of area · worst D4
Arizona
10 reservoirs
Average fill
61.9%
Drought status: 54.0% of area · worst D2
New Mexico
16 reservoirs
Average fill
25.1%
Drought status: 82.4% of area · worst D3
Minnesota
9 reservoirs
Average fill
63.7%
Drought status: 62.6% of area · worst D3
Tennessee
6 reservoirs
Average fill
83.7%
Drought status: 60.6% of area · worst D3
Colorado
34 reservoirs
Average fill
45.8%
Drought status: 71.5% of area · worst D4
Georgia
6 reservoirs
Average fill
75.7%
Drought status: 25.9% of area · worst D2
Arkansas
2 reservoirs
Average fill
85.1%
Drought status: 93.2% of area · worst D4
Mississippi
12 reservoirs
Average fill
49.1%
Drought status: 76.7% of area · worst D3
Oregon
24 reservoirs
Average fill
13.7%
Drought status: 88.3% of area · worst D3
Washington
14 reservoirs
Average fill
19.0%
Drought status: 65.8% of area · worst D3
Virginia
5 reservoirs
Average fill
69.6%
Drought status: 34.5% of area · worst D3
New York
8 reservoirs
Average fill
80.7%
Drought status: 0.0% of area · worst D0
Alabama
7 reservoirs
Average fill
98.9%
Drought status: 49.7% of area · worst D3
Massachusetts
2 reservoirs
Average fill
79.6%
Drought status: 8.0% of area · worst D1
Ohio
27 reservoirs
Average fill
56.0%
Drought status: 0.0% of area · worst D0
Pennsylvania
13 reservoirs
Average fill
67.9%
Drought status: 0.9% of area · worst D0
Nebraska
26 reservoirs
Average fill
49.9%
Drought status: 44.3% of area · worst D3
Indiana
6 reservoirs
Average fill
74.8%
Drought status: 0.0% of area · worst D0
Iowa
4 reservoirs
Average fill
81.9%
Drought status: 0.0% of area · worst D0
Illinois
5 reservoirs
Average fill
82.1%
Drought status: 9.6% of area · worst D1
West Virginia
9 reservoirs
Average fill
69.5%
Drought status: 0.7% of area · worst D0
North Carolina
3 reservoirs
Average fill
65.2%
Drought status: 59.9% of area · worst D3
Florida
1 reservoir
Average fill
84.7%
Drought status: 41.0% of area · worst D3
South Carolina
0 reservoirs
Average fill
0.0%
Drought status: 57.2% of area · worst D2
Wisconsin
0 reservoirs
Average fill
0.0%
Drought status: 50.6% of area · worst D4
All reservoirs
Click a pin to exploreLoading map…
US territory · tracked separately
Puerto Rico — 19 reservoirs
Puerto Rico publishes reservoir elevation, not storage, so its reservoirs cannot be given a fill % or ranked on the map above. They have their own page, in metres above sea level, with records back to 1990.
States shown as N/A
Alaska, Connecticut, Delaware, District of Columbia, Hawaii, Maine, Maryland, Michigan, New Hampshire, New Jersey, Rhode Island and Vermont have no reservoirs in the federal datasets we use — USGS NWIS, the Bureau of Reclamation (RISE) and USACE — which cover primarily the 17 western Reclamation states. Eastern, coastal and non-contiguous states are mostly managed by state agencies or USACE districts without a public storage API, so they appear as N/A on the map. We're adding sources as they become available.
Dataset coverage
Tracked
666
reservoirs
With data
666
reservoirs
Tracked capacity
394,460
hm³
Source: USGS NWIS · USACE CWMS · Bureau of Reclamation RISE · CDEC (California) · SRP (Arizona) · TWDB (Texas)
Federal systems track a subset of US reservoirs. Many state-managed and smaller reservoirs have no public machine-readable storage data. The US has thousands of reservoirs beyond those covered here.
About reservoirs in United States
As of October 14, 2026, the reservoirs we track across United States that report live levels hold roughly 216,852 hm³ of water — about 56.8% of their combined capacity. Taken together, United States's reservoirs are within their normal operating range.
Across the region, 94 reservoirs are at critically low levels and 96 are low. Bankhead Lock and Dam is the fullest at 105.0%, while Mud Mountain Lake is the lowest at 0.0%.
Over the most recent week on record, 49 reservoirs rose and 92 reservoirs fell across United States.
Storage figures for United States come from USGS · USACE · BOR · CDEC · SRP · TWDB; the most recent reading is from October 14, 2026. Each reservoir below links to its own page with full history and seasonal context.
United States at a glance
- Reservoirs tracked
- 666
- Average fill
- 56.8%
- Water stored
- 216,852 hm³
- Combined capacity
- 394,460 hm³
- At critically low levels
- 94
- Fullest
- Bankhead Lock and Dam (105.0%)
- Lowest
- Mud Mountain Lake (0.0%)
- Last updated
- October 14, 2026