Lake Shayne-Terre du Lac Lakes is a 51-acre cold, clear oligotrophic lake in Washington County, Missouri. Water quality is graded A based on 3 sampling years through 2024. Overall water quality is improving over recent sampling years. 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, Missouri DNR, last sampled 2024-08-13. Grade methodology: LakeGrade methodology.
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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 |
Where to stay near Lake Shayne-Terre du Lac Lakes
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Fishing Lake Shayne-Terre du Lac Lakes
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.098 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.46 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.28 µg/L/yr | 5 |
Water Temperature
Lake Shayne-Terre du Lac Lakes averages about 82°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in Apr (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 91 field readings (2010–2024) via the EPA Water Quality Portal. See the full Lake Shayne-Terre du Lac Lakes water temperature breakdown →
Location
County Ranking
Ranked #1 of 2 lakes in Washington County
Nearby Lakes in Washington County
Explore Lake Shayne-Terre du Lac Lakes across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
St. Francois County · Clarity: 16.3 ft
St. Francois County · Clarity: 14.1 ft
St. Francois County · Clarity: 14.3 ft
Iron County · Clarity: 13.1 ft
Ste. Genevieve County · Clarity: 9.9 ft
Jefferson County · Clarity: 12.9 ft
Oligotrophic Lakes in Missouri
More records, surveys & data sources
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)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lake Shayne-Terre du Lac Lakes under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Terre Dulac North Three Cell LagoonBonne Terre · 2.1 mi away · NPDES MO0035700Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-13
Monitoring stations: 1