Lake Shayne-Terre du Lac Lakes
Washington County, WisconsinOligotrophic
Lake Shayne-Terre du Lac Lakes is a 51-acre cold, clear oligotrophic lake in Washington County, MO. Water quality is graded A based on 3 sampling years through 2024. Compared to the 1 other monitored lakes in Washington County, Lake Shayne-Terre du Lac Lakes ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-13. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 11.1 ft. Phosphorus level: 5 µg/L. Chlorophyll-a: 1.2 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.1 ft | B |
| Phosphorus | 5 µg/L | A |
| Chlorophyll-a (Algae) | 1.2 µg/L | A |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 51 acres |
Location
County Ranking
Ranked #1 of 2 lakes in Washington County
Nearby Lakes in Washington County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Jefferson County · Clarity: 12.9 ft
St. Francois County · Clarity: 14.1 ft
St. Francois County · Clarity: 14.3 ft
Warren County · Clarity: 12.6 ft
St. Francois County · Clarity: 16.3 ft
Taney County · Clarity: 13.3 ft
Oligotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Lake Shayne-Terre du Lac Lakes is a man-made reservoir impounded by the Lac Shayne Dam (completed 1979), built primarily for recreation on the POND CREEK; earth-type dam, 72 ft tall and 1,600 ft long.
- Surface area
- 51 ac
- Normal storage
- 2,475 ac-ft
- Max storage
- 2,475 ac-ft
- Drainage area
- 0.7 sq mi
- Hazard class
- High
- Owner
- TERRE DU LAC POA
Source: USACE National Inventory of Dams, NID ID MO31835 · Operator website · Matched by proximity (0.07 km)
EPA Impairment Status
Lake Shayne-Terre du Lac Lakes 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_7297.00 · Official waterbody report · Matched by proximity (1.1 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: 2024-08-13
Monitoring stations: 1