Grassy Lake
Source: U.S. Bureau of Reclamation (RISE)
SSE 3 mph · rain 0%
ESE 2 to 6 mph · rain 3%
Level history
Field notes
As of Oct 24, 2026, Grassy Lake stood at 7,180.11 (NAVD88) ft.
Reclamation reports storage of 7,039 acre-feet for the same day.
Over the past 7 days the lake has been rising (+0.35 ft), and it is +1.27 ft over 30 days.
Readings come from the Bureau of Reclamation's daily reservoir data for Grassy Lake and Grassy Lake Dam (GRS).
Lake facts
| Storage (latest) | 7,039 acre-feet |
|---|---|
| Gauge / station | Grassy Lake and Grassy Lake Dam (GRS) |
| Elevation datum | ft (NAVD88) |
| Gauge location | 44.1297, -110.8194 |
Nearby lakes
Common questions
Is Grassy Lake rising or falling?
Over the last 7 days it changed +0.35 ft and over 30 days +1.27 ft.
How full is Grassy Lake?
Reclamation publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.
How often is this page updated?
The page is rebuilt automatically every day from Reclamation's published data. Values can be revised later by the source agency.
Where does the data come from?
The U.S. Bureau of Reclamation's RISE data portal (data.usbr.gov). Forecasts come from the National Weather Service.
Daily values published by the Bureau of Reclamation; provisional and subject to revision. Reclamation data are provisional and subject to revision unless otherwise noted. This page is not affiliated with or endorsed by the Bureau of Reclamation. See data sources.