The Ahnapee River on February 7, 2022, taken from the International Space Station. The source of the river (lower right) is at the southeast of Gardner Swamp. The millpond at Forestville (center) appears as a long white spot. The river flows southwest towards its mouth at Algoma (upper left).
The source of the upper portion of the Ahnapee River upstream from where it crosses Wisconsin Highway 57, taken June 27, 2020
The upper part of the Forestville Millpond, with the upper portion of the Ahnapee River flowing into it; taken June 27, 2020
The lower part of the Forestville Millpond and the start of the lower portion of the Ahnapee River; taken June 27, 2020
The Ahnapee on June 27, 2020 as it crosses the Door–Kewaunee county line.
The river in Algoma, from a postcard postmarked in 1960
| Ahnapee River | |
|---|---|
 The Ahnapee River below the dam at Forestville | |
 | |
| Native name | Aanapii (Ojibwe) |
| Location | |
| Country | United States |
| State | Wisconsin |
| Region | Door Peninsula |
| Physical characteristics | |
| Source | Gardner Swamp |
| • location | Wisconsin |
| • coordinates | 44°46′08″N 87°32′21″W / 44.76889°N 87.53917°W |
| Mouth | Lake Michigan |
• location | Algoma, Wisconsin |
• coordinates | 44°36′30″N 87°25′59″W / 44.60833°N 87.43306°W |
| Length | 15 mi (24 km) |
| Basin features | |
| Tributaries | |
| • left | Silver Creek |
The Ahnapee River is a 14.7-mile-long (23.7 km) river on the Door Peninsula in eastern Wisconsin in the United States. It rises in Door County, Wisconsin, and flows through Kewaunee County into Lake Michigan at the city of Algoma. Its name has been ascribed as coming from the Ojibwe word aanapii meaning "when?".
