Otter Lake is a 765-acre (3.0 km²) reservoir in Macoupin County, Illinois. It is located 6 miles (10 km) west of Girard. The reservoir is named after Otter Creek, a tributary of Macoupin Creek and the Illinois River.[1]

Otter Lake
Otter Lake
Location	Macoupin County, Illinois
Coordinates	39°24′29″N 089°54′42″W
Type	reservoir
Primary inflows	Otter Creek
Primary outflows	Otter Creek
Basin countries	United States
Surface area	765 acres (310 ha)

Otter Creek was dammed to provide flood control, water-based recreation, and a source of clean water for North Otter and South Otter Townships within Macoupin County. Recreation centers on fishing opportunities, with the lake managed for striped bass, crappie, and muskie.

There is a strictly-enforced power limit on the lake, with motors banned if stronger than 115 horsepower. The lake is troubled by sedimentation, with riprap applied to many patches of shoreline to reduce (but not eliminate) erosion of silt into the lake. Historically, quantities of atrazine have entered the lake from nearby farm fields to which the chemical is applied.[2]

References

External links

• Illinois Natural History Survey
• Otter Lake Fishing
• U.S. Geological Survey Geographic Names Information System: Otter Lake