Reservoir Watch
Official storage levels across 706 reservoirs in 39 states. Data from the US Bureau of Reclamation.
Average fill
55.9%
Total volume
221.0 km³
Reservoirs
706
Critical
113
Low level
96
Fill by state
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US at a glance
National average fill
55.9%
220,999 of 397,653 hm³ stored
Reservoirs
706
States
39
Total capacity
397.7 km³
Volume stored
221.0 km³
Critical
113
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: 2026-10-23.
Drought vs storage
U.S. Drought Monitor · weeklyDrought Monitor · 20 October 2026
Weekly map · area in each categoryDrought status
42.5%
of the area in drought (D1 or worse)
Worst category: D4 exceptional drought
down 2.6 points on the week
Severe or worse (D2+)
24.0%
Extreme or worse (D3+)
7.8%
DSCI
1370–500
People in drought
92.6 million
Reservoirs (reservoirs.earth)
55.9% full706 tracked
Reservoirs on drought ground
385 of 678240 in D2 or worse
As of the 20 October 2026 U.S. Drought Monitor map, 42.5% of the United States was in drought (D1 or worse), with 7.8% in extreme or exceptional drought (D3–D4). Across the Lower 48 alone the figure was 50.7%. The 706 reservoirs we track in the United States were 55.9% full on their latest readings. 385 of 678 tracked reservoir sites sit inside the drought area, 240 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 capacityCalifornia
76 reservoirs
Average fill
59.5%
Drought status: 23.3% of area · worst D1
Texas
121 reservoirs
Average fill
68.4%
Drought status: 70.2% of area · worst D3
Utah
27 reservoirs
Average fill
29.6%
Drought status: 91.3% of area · worst D3
Nevada
7 reservoirs
Average fill
26.6%
Drought status: 95.8% of area · worst D3
Montana
24 reservoirs
Average fill
79.3%
Drought status: 20.5% of area · worst D3
South Dakota
14 reservoirs
Average fill
74.7%
Drought status: 61.3% of area · worst D2
North Dakota
10 reservoirs
Average fill
74.7%
Drought status: 52.5% of area · worst D3
Oklahoma
48 reservoirs
Average fill
65.1%
Drought status: 89.2% of area · worst D4
Kentucky
17 reservoirs
Average fill
53.1%
Drought status: 13.6% of area · worst D1
New Mexico
28 reservoirs
Average fill
27.0%
Drought status: 60.5% of area · worst D3
Wyoming
26 reservoirs
Average fill
37.3%
Drought status: 85.6% of area · worst D3
Missouri
10 reservoirs
Average fill
36.7%
Drought status: 45.0% of area · worst D4
Kansas
34 reservoirs
Average fill
61.6%
Drought status: 23.0% of area · worst D2
Louisiana
3 reservoirs
Average fill
65.8%
Drought status: 88.6% of area · worst D4
Idaho
20 reservoirs
Average fill
24.0%
Drought status: 65.8% of area · worst D4
Arizona
10 reservoirs
Average fill
63.0%
Drought status: 41.1% of area · worst D2
Colorado
40 reservoirs
Average fill
43.7%
Drought status: 61.1% of area · worst D4
Minnesota
9 reservoirs
Average fill
62.9%
Drought status: 62.6% of area · worst D3
Tennessee
6 reservoirs
Average fill
82.4%
Drought status: 64.2% of area · worst D4
Georgia
6 reservoirs
Average fill
74.3%
Drought status: 21.1% of area · worst D2
Washington
15 reservoirs
Average fill
31.0%
Drought status: 61.5% of area · worst D3
Arkansas
2 reservoirs
Average fill
84.2%
Drought status: 94.6% of area · worst D4
Mississippi
12 reservoirs
Average fill
44.9%
Drought status: 84.6% of area · worst D4
Oregon
24 reservoirs
Average fill
13.2%
Drought status: 88.3% of area · worst D3
Virginia
5 reservoirs
Average fill
70.2%
Drought status: 24.5% of area · worst D3
New York
8 reservoirs
Average fill
79.8%
Drought status: 1.6% of area · worst D1
Alabama
7 reservoirs
Average fill
93.9%
Drought status: 33.2% of area · worst D2
Massachusetts
2 reservoirs
Average fill
79.6%
Drought status: 3.9% of area · worst D1
Ohio
28 reservoirs
Average fill
50.6%
Drought status: 0.0% of area · worst D0
Pennsylvania
13 reservoirs
Average fill
63.8%
Drought status: 0.6% of area · worst D0
Nebraska
26 reservoirs
Average fill
49.9%
Drought status: 43.3% of area · worst D3
Indiana
6 reservoirs
Average fill
72.9%
Drought status: 0.0% of area · worst D0
Iowa
4 reservoirs
Average fill
73.1%
Drought status: 0.0% of area · worst D0
Illinois
5 reservoirs
Average fill
83.2%
Drought status: 23.9% of area · worst D1
West Virginia
9 reservoirs
Average fill
64.0%
Drought status: 0.0% of area · worst D0
North Carolina
3 reservoirs
Average fill
59.4%
Drought status: 49.6% of area · worst D3
Florida
1 reservoir
Average fill
85.9%
Drought status: 23.9% of area · worst D2
South Carolina
0 reservoirs
Average fill
0.0%
Drought status: 44.8% of area · worst D2
Wisconsin
0 reservoirs
Average fill
0.0%
Drought status: 51.9% of area · worst D4
All reservoirs
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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
728
reservoirs
With data
728
reservoirs
Tracked capacity
408,769
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 23, 2026, the reservoirs we track across United States that report live levels hold roughly 220,999 hm³ of water — about 55.9% of their combined capacity. Taken together, United States's reservoirs are within their normal operating range.
Across the region, 113 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, 87 reservoirs rose and 181 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 23, 2026. Each reservoir below links to its own page with full history and seasonal context.
United States at a glance
- Reservoirs tracked
- 728
- Average fill
- 55.9%
- Water stored
- 220,999 hm³
- Combined capacity
- 408,769 hm³
- At critically low levels
- 113
- Fullest
- Bankhead Lock and Dam (105.0%)
- Lowest
- Mud Mountain Lake (0.0%)
- Last updated
- October 23, 2026