Lakes / Alaska / Yukon-Koyukuk County / Fortymile Lake
Fortymile Lake, Yukon-Koyukuk County, Alaska
52 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Alaska
66.78 degrees N, 147.54 degrees W - Yukon-Koyukuk 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 Fortymile Lake Stacks Up
- Larger than 16% of the 2,450 lakes counted in Alaska.
- About 134 miles from Fairbanks, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Howard Lake | Yukon-Koyukuk | 11 mi | 138 acres |
| Adam Lake | Yukon-Koyukuk | 19 mi | 263 acres |
| Nelson Lake | Yukon-Koyukuk | 20 mi | 1,005 acres |
| Long Lake | Yukon-Koyukuk | 21 mi | 522 acres |
| Vunzik Lake | Yukon-Koyukuk | 23 mi | 97 acres |
| Vunlui Lake | Yukon-Koyukuk | 23 mi | 77 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Fortymile Lake
How Big Is Fortymile Lake?
Fortymile Lake covers 52 acres in Yukon-Koyukuk County, Alaska.
What Is the Largest Lake in Yukon-Koyukuk County?
Lake Minchumina is the largest lake in Yukon-Koyukuk County, at 11,712 acres.
Largest Lakes in Alaska
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Iliamna Lake | Lake and Peninsula | 654,518 acres | - |
| 2 | Becharof Lake | Lake and Peninsula | 289,706 acres | - |
| 3 | Teshekpuk Lake | North Slope | 206,614 acres | - |
| 4 | Naknek Lake | Lake and Peninsula | 145,357 acres | - |
| 5 | Dall Lake | Bethel | 111,681 acres | - |
All 2,450 Alaska 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 38822846). Verified October 30, 2026.