Lakes / California / Napa County / Lake Hennessey
Lake Hennessey, California
763 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
38.49 degrees N, 122.37 degrees W - Napa County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Lake Hennessey Stacks Up
- Larger than 87% of the 1,147 lakes counted in California.
- About 48 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Rector Reservoir | Napa | 3.8 mi | 81 acres |
| Bell Canyon Reservoir | Napa | 7.7 mi | 74 acres |
| Moskowitz Reservoir | Napa | 10 mi | 28 acres |
| Lake Berryessa | Napa | 10 mi | 18,083 acres |
| Milliken Reservoir | Napa | 11 mi | 41 acres |
| Weeks Lake | Napa | 11 mi | 124 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Hennessey
How Big Is Lake Hennessey?
Lake Hennessey covers 763 acres in Napa County, California.
What Is the Largest Lake in Napa County?
Lake Berryessa is the largest lake in Napa County, at 18,083 acres.
Largest Lakes in California
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Salton Sea | Imperial | 233,096 acres | - |
| 2 | Lake Tahoe | Placer | 122,975 acres | - |
| 3 | Goose Lake | Modoc | 93,048 acres | - |
| 4 | Honey Lake | Lassen | 59,917 acres | - |
| 5 | Mono Lake | Mono | 45,124 acres | - |
All 1,147 California lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 120026397). Verified October 30, 2026.