Johnson Creek (Rock River tributary)
| Johnson Creek | |
| Creek | |
| Country | United States |
|---|---|
| State | Wisconsin |
| Part of | Rock River (Mississippi River) |
| City | Watertown, Johnson Creek |
| Source | |
| - coordinates | 43°10′44″N 88°42′18″W / 43.179°N 88.705°W |
| Mouth | |
| - coordinates | 43°04′19″N 88°47′35″W / 43.072°N 88.793°WCoordinates: 43°04′19″N 88°47′35″W / 43.072°N 88.793°W |
| Length | 20.8 mi (33 km) |
| Basin | 45.22 sq mi (117 km2) |
Johnson Creek is a minor tributary of the Rock River, about 20.8 miles (33.5 km) long, in southeastern Wisconsin in the United States. Via the Rock River, it is part of the watershed of the Mississippi River. Its watershed lies entirely within Jefferson County.
Johnson Creek rises in northern Jefferson County within the city limits of Watertown and follows a J-shaped course through the northern half of the county. Upon entering the city of Johnson Creek from the south, it turns sharply to the west and flows into the Rock River on the west end of the city, near where County Road B crosses the Rock River.
Numerous small streams empty into the creek, and there is one recognized lake in the watershed. The 4.2-acre (1.7 ha) lake is officially unnamed, but is locally called Lake Dorothy. Portions of the creek and its many small branches are channelized.
The watershed, including the majority of Farmington and portions of Watertown, Concord, Jefferson, and Aztalan, is mostly rural. U.S. Route 18 passes along the southern edge of the watershed, and Interstate 94 crosses through it from east to west.
The region is predominantly agricultural, with some wetlands, grassland, and forested areas. The Wisconsin DNR labels the majority of the landtype as the Watertown drumlins: "the landform pattern is undulating till plain with drumlins, lake plains, and muck areas common. Soils are predominantly moderately well drained silt and loam over calcareous sandy loam till or silty, loamy and clayey lacustrine." Small portions are associated with the Jefferson Lake Plains; the entire area is contained within the southeast glacial plains. The original vegetation cover is primarily sugar maple, basswood, red oak, white oak, and black oak, with smaller areas of swamp conifers, lowland hardwoods, and marsh and sedge meadow with lowland shrubs.
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