Lakes / Alaska / Yukon-Koyukuk County / Fortymile Lake
Fortymile Lake, Yukon-Koyukuk County, Alaska
158 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Alaska
63.67 degrees N, 152.67 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 51% of the 2,450 lakes counted in Alaska.
- About 169 miles from Fairbanks, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Thirtyeight Mile Lake | Yukon-Koyukuk | 1.9 mi | 206 acres |
| Yoder Lake | Denali | 2.6 mi | 95 acres |
| Fish Creek Lake | Yukon-Koyukuk | 2.8 mi | 230 acres |
| Blackfish Lake | Denali | 4.2 mi | 154 acres |
| Moose Lake | Denali | 5.6 mi | 135 acres |
| Sprucefish Lake | Denali | 6.9 mi | 531 acres |
Straight-line distance between lake centers.
Facts and Figures
Waterbody ID{BE30DB13-5702-45B5-8882-43593757A9A2}
CountyYukon-Koyukuk
Lake TypeLake
Coordinates63.6668, -152.6653
Questions About Fortymile Lake
How Big Is Fortymile Lake?
Fortymile Lake covers 158 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 {BE30DB13-5702-45B5-8882-43593757A9A2}). Verified October 30, 2026.