North Bethany City Reservoir
Harrison County, WisconsinMesotrophic
North Bethany City Reservoir is a 76-acre mesotrophic lake in Harrison County, MO. Water quality is graded B based on 3 sampling years through 2022. Compared to the 2 other monitored lakes in Harrison County, North Bethany City Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-10-12. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.5 ft. Phosphorus level: 11 µg/L. Chlorophyll-a: 6.9 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | B |
| Phosphorus | 11 µg/L | A |
| Chlorophyll-a (Algae) | 6.9 µg/L | B |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 76 acres |
Location
County Ranking
Ranked #1 of 3 lakes in Harrison County
Nearby Lakes in Harrison County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
North Bethany City Reservoir is a man-made reservoir impounded by the City of Bethany Dam (completed 1960), built primarily for water supply on the TRIBUTARY TO WEST FORK BIG CK; earth-type dam, 60 ft tall and 1,000 ft long.
- Surface area
- 76 ac
- Normal storage
- 2,820 ac-ft
- Max storage
- 3,850 ac-ft
- Drainage area
- 1.15 sq mi
- Hazard class
- High
- Owner
- CITY OF BETHANY
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID MO10071 · Operator website · Matched by proximity (0.09 km)
EPA Impairment Status
North Bethany City Reservoir 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_7109.00 · Official waterbody report · Matched by proximity (0.38 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: 2022-10-12
Monitoring stations: 1