Lake Nehai Tonkayea
Chariton County, WisconsinOligotrophic
Lake Nehai Tonkayea is a 250-acre cold, clear oligotrophic lake in Chariton County, MO. Water quality is graded B based on 3 sampling years through 2023. Compared to the 2 other monitored lakes in Chariton County, Lake Nehai Tonkayea ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-08-10. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 8 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 1.3 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | 10 µg/L | A |
| Chlorophyll-a (Algae) | 1.3 µg/L | A |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 250 acres |
Location
County Ranking
Ranked #1 of 3 lakes in Chariton County
Nearby Lakes in Chariton County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Oligotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Lake Nehai Tonkayea is a man-made reservoir impounded by the Nehai Tonkayea Lake Dam (completed 1970), built primarily for recreation on the TR-MUSSEL FORK; earth-type dam, 65 ft tall and 1,700 ft long.
- Surface area
- 250 ac
- Normal storage
- 5,417 ac-ft
- Max storage
- 9,100 ac-ft
- Drainage area
- 1.48 sq mi
- Hazard class
- Low
- Owner
- NEHAI TONKAYEA POA
Source: USACE National Inventory of Dams, NID ID MO10627 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-08-10
Monitoring stations: 1