Grassy Lake Dam
Dam in Teton County, Wyoming · Grassy Creek · forms Grassy Lake
Height
118 ft
36 m (NID height)
Length
1,170 ft
357 m
Completed
1939
Grassy Lake today
7,179.90 ft
7 days ▲ 0.24 ft
Normal storage
15,470 acre-ft
Reservoir level measured Oct 21, 2026, 12:00 AM MDT. Full level page →
Facts
- Purposes
- Irrigation
- Dam type
- Earth
- Structural height
- 118 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 16,210 acre-ft
- Surface area
- 318 acres
- Hydraulic height
- 100 ft
- Drainage area
- 4 sq mi
- Spillway
- Uncontrolled, 20 ft wide
- Army Corps district
- Omaha District
- Also known as
- Grassy Lake
- NID ID
- WY01384
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID WY01384 at nid.sec.usace.army.mil. Project website.