Long Branch Lk. Lake
Macon County, WisconsinEutrophic
Long Branch Lk. Lake is a 2,430-acre productive, nutrient-rich eutrophic lake in Macon County, MO. Water quality is graded D based on 3 sampling years through 2024. Compared to the 3 other monitored lakes in Macon County, Long Branch Lk. Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-15. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 1.8 ft of visibility. Phosphorus level: 43.5 µg/L. Chlorophyll-a: 16.1 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | F |
| Phosphorus | 43.5 µg/L | C |
| Chlorophyll-a (Algae) | 16.1 µg/L | C |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2.4K acres |
Location
County Ranking
Ranked #3 of 4 lakes in Macon County
Cleaner Lakes Within 30 Miles
Long Branch Lk. Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Macon County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
St. Louis city County · Clarity: 2.3 ft
Shelby County · Clarity: 3.2 ft
Harrison County · Clarity: 1.7 ft
Stone County · Clarity: 2.3 ft
Knox County · Clarity: 2.1 ft
Camden County · Clarity: 2.7 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Long Branch Lk. Lake is a man-made reservoir impounded by the Long Branch Dam (completed 1978), built primarily for flood risk reduction on the EAST FORK LITTLE CHARITON; earth-type dam, 80 ft tall and 3,800 ft long.
- Surface area
- 2,430 ac
- Normal storage
- 35,000 ac-ft
- Max storage
- 98,000 ac-ft
- Drainage area
- 109 sq mi
- Hazard class
- High
- Owner
- USACE - Kansas City District
All listed purposes: Flood Risk Reduction;Other;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO11176 · Operator website
EPA Impairment Status
Long Branch Lk. Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7168.00 · Official waterbody report · Matched by proximity (2.02 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-15
Monitoring stations: 1