Morgan County Lake Quality
Wisconsin, 38 lakes, average grade C (Fair)
There are 38 graded lakes in Morgan County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. Morgan County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Buck 17 Lake (B) is the cleanest in the county.
Quick Answers for Morgan County
Planning a trip? Check special fishing regulations for Buck 17 Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Morgan County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Buck 17 Lake | B | 6.8 ft | - | 19 µg/L |
| 2 | Crystal-Morgan Lake | B | 6.2 ft | - | 15.5 µg/L |
| 3 | Loto Confluence of Gravois And Indian Creek Lake | B | 7.5 ft | - | 18 µg/L |
| 4 | Loto Lake | B | 8 ft | - | 18 µg/L |
| 5 | Grav Arm 10 Lake | B | 7.1 ft | - | 18 µg/L |
| 6 | Loto Lake | B | 7.5 ft | - | 18 µg/L |
| 7 | Grav Arm 12 Lake | B | 6.7 ft | - | 20 µg/L |
| 8 | Grav Arm 5 Lake | B | 6 ft | - | 17.5 µg/L |
| 9 | Grav Arm 11 Lake | B | 8.4 ft | - | 21 µg/L |
| 10 | Grav Arm 2 Lake | B | 7 ft | - | 22 µg/L |
| 11 | Buck Lk 1 Lake | B | 9.2 ft | - | 21 µg/L |
| 12 | Grav Arm 6 Lake | B | 6.2 ft | - | 18 µg/L |
| 13 | Grav Arm 9 Lake | B | 7 ft | - | 24 µg/L |
| 14 | Loto Lake | C | 4.9 ft | - | 18 µg/L |
| 15 | Loto Lake | C | 4.5 ft | - | 23 µg/L |
| 16 | Loto Lake | C | 5.6 ft | - | 21 µg/L |
| 17 | Grav Arm 8 Lake | C | 5.5 ft | - | 19 µg/L |
| 18 | Buck 19 Lake | C | 4.7 ft | - | 21 µg/L |
| 19 | Loto Lake | C | 5.3 ft | - | 24 µg/L |
| 20 | Buck 22 Lake | C | 5.3 ft | - | 19 µg/L |
| 21 | Buck 18 Lake | C | 4.9 ft | - | 24 µg/L |
| 22 | Loto Lake | C | 5.6 ft | - | 25 µg/L |
| 23 | Loto Lake | C | 5 ft | - | 24 µg/L |
| 24 | Loto Lake | C | 4.1 ft | - | 22 µg/L |
| 25 | Lick 2 Lake | C | 6.2 ft | - | 20 µg/L |
| 26 | Grav Arm 1 Lake | C | 6 ft | - | 27 µg/L |
| 27 | Loto Lake | C | 6.2 ft | - | 23 µg/L |
| 28 | Lick 1 Lake | C | 6.4 ft | - | 22.5 µg/L |
| 29 | Grav Arm 4 Lake | C | 5.9 ft | - | 27 µg/L |
| 30 | Buck 20 Lake | C | 5.3 ft | - | 21 µg/L |
| 31 | Grav If 6 Lake | C | 6 ft | - | 22 µg/L |
| 32 | Loto Lake | C | 4.2 ft | - | 27 µg/L |
| 33 | Grav If 4 Lake | C | 4.2 ft | - | 31 µg/L |
| 34 | Buck 21 Lake | D | 4.9 ft | - | 24 µg/L |
| 35 | Loto Lake | D | 1.3 ft | - | 61.5 µg/L |
| 36 | Grav If 2 Lake | D | 3.5 ft | - | 37 µg/L |
| 37 | Loto Lake | D | 3 ft | - | 43 µg/L |
| 38 | Grav If 3 Lake | D | 2.4 ft | - | 58 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.