Harmon Lake
Morton County, WisconsinLimited DataEutrophic
Harmon Lake is a 144-acre productive, nutrient-rich eutrophic lake in Morton County, ND. Water quality is graded F based on 1 sampling years through 2023. Compared to the 3 other monitored lakes in Morton County, Harmon Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-07-12. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Chlorophyll-a: 48.5 µg/L. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 48.5 µg/L | F |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 144 acres |
Location
County Ranking
Ranked #4 of 4 lakes in Morton County
Cleaner Lakes Within 30 Miles
Harmon Lake holds Grade F. 5 nearby lakes hold higher grades.
- BArroda LakeOliver County · 23.9 mi · Two grade letters higher (F → B)
- CEast Arroda LakeOliver County · 23.9 mi · Two grade letters higher (F → C)
- DMcdowell Dam LakeBurleigh County · 17.4 mi · Higher grade (F → D)
- DNelson LakeOliver County · 14.5 mi · Higher grade (F → D)
- DNygren Dam LakeMorton County · 26.7 mi · Higher grade (F → D)
Nearby Lakes in Morton County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Harmon Lake is a man-made reservoir impounded by the Square Butte Creek Dam 6 (completed 2007), built primarily for recreation on the Otter Creek; earth-type dam, 81 ft tall and 2,100 ft long.
- Surface area
- 144 ac
- Normal storage
- 2,399 ac-ft
- Max storage
- 8,297 ac-ft
- Drainage area
- 37.4 sq mi
- Hazard class
- Significant
- Owner
- Morton County WRB
All listed purposes: Recreation;Flood Risk Reduction.
Source: USACE National Inventory of Dams, NID ID ND00794 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-12
Monitoring stations: 3