Table 11. Summary statistics for elevation (m) within each ISA, based on 3-arc-second (roughly 90-m) DEM data.
 

ISA	Minium	Maximum	Range	Mean	Std. Dev.
Potter Creek	2475	2485	10	2469	2
Illinois River	2465	2479	14	2480	3
Michigan River	2557	2585	28	2568	8
Buffalo Pass	3048	3231	183	3144	36
Spring Creek	2599	2777	178	2684	42
Walton Creek	2926	2983	57	2953	15
St. Louis Creek	2701	2743	42	2726	11
Fool Creek	3025	3259	234	3132	60
Alpine	3352	3657	305	3557	65