How many lakes are in the Iowa Great Lakes area?

The Iowa Great Lakes area has 8 graded lakes with an average water quality grade of D (Poor). 1 lakes have Grade A water quality.

Iowa Great Lakes

A cluster of natural lakes in Dickinson County left by the Wisconsinan glaciation, including Spirit Lake — Iowa's largest natural lake — and deep, spring-fed West Lake Okoboji. The chain is Iowa's premier lake resort area, anchored by the town of Okoboji and the historic Arnolds Park amusement park on West Okoboji's shore.

Reviewed by LakeQuality Editorial Team · Updated Jul 5, 2026

Lakes

Avg Grade

Grade A Lakes

With Fish Data

Lake	County	Grade	Clarity	Depth
West Okoboji Lake	Dickinson	A	15.7 ft	-
Upper Gar Lake	Dickinson	C	3.9 ft	-
Big Spirit Lake	Dickinson	C	5.5 ft	-
Lake Minnewashta	Dickinson	D	2.8 ft	-
East Okoboji Lake	Dickinson	D	3.9 ft	-
Lower Gar Lake	Dickinson	D	2.6 ft	-
Silver Lake Max Depth	Dickinson	F	2.7 ft	-
Center Lake	Dickinson	F	2.3 ft	-