Where is Lake Shayne-Terre du Lac Lakes?

Lake Shayne-Terre du Lac Lakes is a lake in Washington County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.

What is the water temperature of Lake Shayne-Terre du Lac Lakes?

Lake Shayne-Terre du Lac Lakes typically sits around 80°F at the surface in September, from 91 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.

How deep is Lake Shayne-Terre du Lac Lakes?

No published bathymetric survey covers Lake Shayne-Terre du Lac Lakes, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 46 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 51 acres.

Lake Shayne-Terre du Lac Lakes

Washington County, Missouri51 acresView map Directions

Excellent

Clarity, phosphorus, and algae all sit in the cleanest band for this region.

Water temp

~80°F

Typical for Sep · EPA WQP

Clarity

11.1 ft

Secchi · sampled 2024

Max depth

~46 ft est.

GLOBathy model

Level

No gauge

Trend

Improving

6 years of samples

Oligotrophic
Impaired · Nutrients (phosphorus, nitrogen)
#1 of 1 in the county
46 ft max depth

See the measurements Directions Where to stay

Lake Shayne-Terre du Lac Lakes in Washington County, Missouri has a water quality grade of A (Excellent). Water clarity: 11.1 ft visibility. Phosphorus: 5.2 µg/L. Chlorophyll-a (algae): 1.2 µg/L. Surface area: 51 acres.

Clarity: 11.1 ft
Typical in September: 80°F
Max depth: ~46 ft est.
Area: 51 acres
Type: Oligotrophic
Phosphorus: 5.2 µg/L
Chlorophyll-a: 1.2 µg/L
Trend: ↑ Improving

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Stays near Lake Shayne-Terre du Lac Lakes

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Watch Lake Shayne-Terre du Lac Lakes’s letter

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Lake Shayne-Terre du Lac Lakes is a 51-acre cold, clear oligotrophic lake in Washington County, Missouri with an estimated average depth of about 46 feet. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years.

Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-13. Grade methodology: LakeQuality methodology.

What Lake Shayne-Terre du Lac Lakes is good for

From access and monitoring records, not editorial picks.

Clear water11.1 ft of visibility

Swimming Safety

Grade only

Low algae

Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.

The A is nutrients and algae, not a swimming clearance. Lake Shayne-Terre du Lac Lakes is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Compare the safest swimming lakes near St. Louis →

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Water Quality Grade: A (Excellent)

Good clarity, visible to about 11.1 ft. Phosphorus 5.2 µg/L. Chlorophyll-a 1.2 µg/L. TSI 34. The letter is not a swimming clearance.

Metric	Value	Grade
Water Clarity (Secchi Depth)	11.1 ft	Not graded
Phosphorus	5.2 µg/L	Good
Chlorophyll-a (Algae)	1.2 µg/L	Good
Trophic State Index (TSI)	34	Oligotrophic

Low nutrients, clear water. The letter is not a swimming clearance.

Water Temperature

Lake Shayne-Terre du Lac Lakes typically sits around 80°F at the surface in September. Summer average is about 82°F. Usually warmest in Jul (about 84°F) and coldest in Apr (about 60°F). These are typical values by month — not a live reading.

Jan

—

Feb

—

Mar

—

Apr

60°

May

72°

Jun

79°

Jul

84°

Aug

82°

Sep

80°

Oct

—

Nov

—

Dec

—

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 →

Lake Details

Characteristic	Value
Maximum Depth	~46 ft est.
Average Depth	~16 ft est.
Surface Area	51 acres

Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Lake Shayne-Terre du Lac Lakes.

Lake Size & Watershed

Watershed (drainage) area

1 sq mi

Shoreline

2.3 mi

Elevation

909 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.

Fishing Lake Shayne-Terre du Lac Lakes

→ Lake Shayne-Terre du Lac Lakes fishing regulations (limits, seasons, special rules)

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	+0.41 µg/L/yr	6
Chlorophyll-a	↑ Improving	-0.26 µg/L/yr	5

See year-by-year chart →

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

Nutrients (phosphorus, nitrogen)

Source: EPA ATTAINS assessment unit MO_7297.00 · Official waterbody report · Matched by proximity (1.1 km)

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 Lagoon
Bonne Terre · 2.1 mi away · NPDES MO0035700
Recent 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.

County Ranking

Ranked #1 of 1 lakes in Washington County

Nearby Lakes in Washington County

NRApex Lake—View →NRHornsey Lake—View →NRHornsey Brothers Lake—View →NRPalmer Lake—View →NRSunnen Lake1 ft clear16 miView →NRSayersbrook Lake—View →

Frequently asked questions about Lake Shayne-Terre du Lac Lakes

Where is Lake Shayne-Terre du Lac Lakes?: Lake Shayne-Terre du Lac Lakes is a lake in Washington County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Shayne-Terre du Lac Lakes?: Lake Shayne-Terre du Lac Lakes in Washington County, Missouri has a water quality grade of A (Excellent). Water clarity: 11.1 ft visibility. Phosphorus: 5.2 µg/L. Chlorophyll-a (algae): 1.2 µg/L. Surface area: 51 acres.
Is Lake Shayne-Terre du Lac Lakes safe to swim in?: The A is nutrients and algae, not a swimming clearance. Lake Shayne-Terre du Lac Lakes is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Lake Shayne-Terre du Lac Lakes?: Lake Shayne-Terre du Lac Lakes typically sits around 80°F at the surface in September, from 91 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Lake Shayne-Terre du Lac Lakes?: No published bathymetric survey covers Lake Shayne-Terre du Lac Lakes, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 46 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 51 acres.

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Where this data comes from

149 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

Univ. of Missouri, ColumbiaUMC149 samples · 2020–2024

Analytical methods

Depth, Secchi disk in meters
4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence

Monitoring station identifiers (1)

UMC-7606/0.1

Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.