Mesotrophic Lakes in Colorado

22 mesotrophic lakes in Colorado. Moderate nutrients, good water quality.

Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 22 lakes in {{stateName}} sit in the mesotrophic band. About 0% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.

Mesotrophic lakes tend to grade B or C on the LakeGrade rubric — the productive-but-clear band lines up with the middle of the letter grades.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Crystal Reservoir	Montrose	A	15.4 ft	-	41
2	Ned Wilson Lake	Rio Blanco	A	-	-	42
3	Lake Granby	Grand	A	12.7 ft	-	40
4	Pueblo Reservoir	Pueblo	B	6.7 ft	-	44
5	Wolford Mountain Reservoir	Grand	B	8.3 ft	-	40
6	Grand Lake	Grand	B	8.9 ft	-	43
7	Summit Lake	Jackson	B	12.1 ft	-	44
8	Blue Mesa Reservoir	Gunnison	B	11.5 ft	-	48
9	Skaguay Reservoir	Teller	B	12.5 ft	-	41
10	Dillon Reservoir	Summit	B	11.6 ft	-	42
11	Elevenmile Reservoir	Park	B	13.1 ft	-	40
12	Mcphee Reservoir	Montezuma	B	10.5 ft	-	43
13	Twin Lakes West	Lake	B	11.5 ft	-	42
14	Green Mountain Reservoir	Summit	B	11.5 ft	-	42
15	Shadow Mountain Lake	Grand	B	7.8 ft	-	47
16	Dowdy Lake	Larimer	C	8.2 ft	-	47
17	Sweetwater Lake	Garfield	C	8 ft	-	47
18	Carter Reservoir	Larimer	C	6.9 ft	-	49
19	Big Meadows Reservoir	Mineral	C	7.2 ft	-	49
20	Rifle Gap Reservoir	Garfield	C	7.9 ft	-	47
21	Ridgway Reservoir	Ouray	C	9.8 ft	-	44
22	North Delaney Lake	Jackson	C	8.2 ft	-	47

All mesotrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →Florida version →North Carolina version →All Colorado lakes →

Source: EPA National Aquatic Resource Surveys, 2026.