Tappan Lake
Harrison County, WisconsinLimited DataEutrophic
Tappan Lake is a 2,350-acre productive, nutrient-rich eutrophic lake in Harrison County, OH. Water quality is graded D based on 1 sampling years through 2020. Compared to the 1 other monitored lakes in Harrison County, Tappan Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-12-01. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 77 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 77 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2.4K acres |
Location
County Ranking
Ranked #1 of 2 lakes in Harrison County
Nearby Lakes in Harrison County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Tappan Lake is a man-made reservoir impounded by the Tappan Dam (completed 1936), built primarily for flood risk reduction on the LITTLE STILLWATER CREEK; earth-type dam, 52 ft tall and 1,550 ft long.
- Surface area
- 2,350 ac
- Normal storage
- 35,100 ac-ft
- Max storage
- 61,600 ac-ft
- Drainage area
- 71 sq mi
- Hazard class
- High
- Owner
- USACE - Huntington District
All listed purposes: Flood Risk Reduction;Fish and Wildlife Pond;Recreation.
Source: USACE National Inventory of Dams, NID ID OH00010 · Operator website
EPA Impairment Status
Tappan Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit OH050400011503 · Official waterbody report · Matched by proximity (2.08 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: 2020-12-01
Monitoring stations: 1