Long Branch L. Lake
Macon County, WisconsinLimited DataEutrophic
Long Branch L. Lake is a 2,430-acre productive, nutrient-rich eutrophic lake in Macon County, MO. Water quality is graded C based on 1 sampling years through 2020. Compared to the 3 other monitored lakes in Macon County, Long Branch L. Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-08-24. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 36 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 36 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2.4K acres |
Location
County Ranking
Ranked #1 of 4 lakes in Macon County
Nearby Lakes in Macon County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Warren County · Clarity: 3.8 ft
Ralls County · Clarity: 3.7 ft
Warren County · Clarity: 3.3 ft
Platte County · Clarity: 4.7 ft
Barry County · Clarity: 5 ft
Phelps County · Clarity: 4.9 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Long Branch L. 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 · Matched by proximity (0.56 km)
EPA Impairment Status
Long Branch L. 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 (1.7 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: 2020-08-24
Monitoring stations: 1