Pensacola
Dam in Mayes County, Oklahoma · Neosho · forms Grand Lake
Height
155 ft
47 m (NID height)
Length
6,565 ft
2,001 m
Completed
1940
Grand Lake today
742.09 ft
7 days ▼ 0.08 ft
vs full pool
▲ 0.09 ft
Normal storage
1,630,000 acre-ft
Reservoir level measured Oct 23, 2026, 12:00 PM CDT. Full level page →
Facts
- Purposes
- Hydroelectric; Flood Risk Reduction
- Dam type
- Multi-Arch
- Structural height
- 151 ft
- Owner
- Grand River Dam Authority (State)
- Maximum storage
- 2,197,000 acre-ft
- Surface area
- 46,500 acres
- Hydraulic height
- 143 ft
- Drainage area
- 10,192 sq mi
- Spillway
- Controlled
- Army Corps district
- Tulsa District
- Also known as
- Grand Lake
- NID ID
- OK00135
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID OK00135 at nid.sec.usace.army.mil. Project website.