Reservoirs
Above normalFontenelle Reservoir water level
Live reservoir storage and water level in Green-Colorado basin, Wyoming
Data through Sep 23, 2026 · source last checked Oct 1, 2026 · page revised Sep 24, 2026
Cite
- Storage
About this data
- Source
- US Bureau of Reclamation RISE; California reservoirs via CA DWR CDEC
- Series
- End-of-day reservoir storage
- Geography
- Fontenelle Reservoir water level
- Unit
- acre-feet
- Calculation
- Daily reading
- Last observation
- Sep 23, 2026
- Update frequency
- Daily
Now 276,396 af, 14% above the 5-yr median, 80% of capacity.
Fontenelle storage stands at 276,396 af, 14% above the 5-yr median and at 80% of capacity. The reservoir dropped 0.8% over the week and 3.8% over the month. Year over year, storage is 15.8% higher.
| Period | Current | Prior | Change |
|---|---|---|---|
| Week over week | 276,396 af | 278,584 af | -0.8% |
| Month over month | 276,396 af | 287,390 af | -3.8% |
| Year over year | 276,396 af | 238,686 af | +15.8% |
| vs 5-yr median | 276,396 af | 243,283 af | +13.6% |
| Measure | Value |
|---|---|
| Latest reading, Sep 23, 2026 | 6,498.38 ft above sea level |
| Change from a week earlier | -0.3 ft |
| Change from a year earlier | +5.34 ft |
| 5-yr median for the date | 6,493.71 ft |
| Below full pool | 7.62 ft |
| Five-year low | 6,467.67 ft (Apr 14, 2023) |
| Five-year high | 6,504.95 ft (Jul 22, 2022) |
| Measure | Value | Source |
|---|---|---|
| Full pool elevation | 6,506 ft above sea level (top of active conservation pool) | USBR |
| Maximum depth at the dam | 121 ft | USBR |
| Surface area at full pool | 7,861 acres | USBR |
| Total capacity | 345,360 acre-feet | USBR |
Previous weeks
Week of Sep 15, 2026
Fontenelle storage stood at 279,096 af, down 1.3% on the week and 4.1% on the month, but up 13.4% year over year. The reservoir sits 12% above its 5-year median at 81% of capacity.
Week of Sep 2, 2026
Fontenelle storage stands at 284,887 af, down 0.8% on the week. Year-over-year the reservoir is up 10% and sits 9% above its 5-year median.
Week of Aug 25, 2026
Fontenelle holds 287,243 af, up 8.1% from a year ago and 7% above the 5-year median. The reservoir released 1.2% on the week but gained 1.1% over the month and sits at 83% of capacity.
Week of Aug 19, 2026
Fontenelle Reservoir holds 290,638 af, 6% above the 5-yr median and at 84% of capacity. Storage has gained 5.2% over the month and 7.2% year over year.
About Fontenelle Reservoir
Fontenelle Reservoir's water level is 6,498.38 feet above sea level as of Sep 23, 2026, 7.62 feet below full pool (6,506 feet), with 276,396 acre-feet in storage (80% of capacity). That is 0.3 feet lower than a week earlier and 5.34 feet higher than a year earlier.
Fontenelle Dam holds the Green River in southwest Wyoming above Flaming Gorge, the central feature of the Seedskadee Project and a Colorado River Storage Project reservoir. Reclamation runs it for storage, hydropower, and flow regulation. A leak nearly failed the dam in 1965, soon after its first filling, before crews drew the reservoir down and repaired the embankment.
Total capacity is 345,360 af, over the past five years storage has ranged from 103,386 af to 325,765 af.
Fontenelle Reservoir is one of the 21 major reservoirs this site totals each day, and one of several it tracks in the Green-Colorado basin. For the combined picture, western reservoir levels carries the storage of all 21 on one chart, which is the number to watch when the question is about the West as a whole rather than about this project.
Those figures describe the reservoir at full pool, not today. The chart at the top of this page tracks storage in acre-feet and the elevation table tracks the water surface in feet, so read storage against total capacity for how full the reservoir is, and the elevation against the full pool elevation and maximum depth for the size of the water column behind the dam. The two do not move together one for one: a reservoir narrows as it deepens, so one holding half its capacity still stands more than half as deep.
Sources: full pool elevation and surface area from the Bureau of Reclamation; maximum depth from the Bureau of Reclamation; total capacity from the Bureau of Reclamation.