Sherwood Lake Nr. Dam is a 145-acre mesotrophic lake in Warren County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Sherwood Lake Nr. Dam ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. Grade methodology: LakeGrade methodology.
Watch Sherwood Lake Nr. Dam water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.9 ft. Phosphorus level: 14.3 µg/L. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | D |
| Phosphorus | 14.3 µg/L | A |
| Chlorophyll-a (Algae) | 4.4 µg/L | A |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 145 acres |
Where to stay near Sherwood Lake Nr. Dam
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Fishing Sherwood Lake Nr. Dam
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.062 m/yr | 5 |
| Phosphorus | ↓ Declining | +6.52 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.46 µg/L/yr | 5 |
Water Temperature
Sherwood Lake Nr. Dam averages about 83°F at the surface in summer, usually warmest in Jul (about 86°F) and coldest in Apr (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 93 field readings (2010–2024) via the EPA Water Quality Portal. See the full Sherwood Lake Nr. Dam water temperature breakdown →
Location
County Ranking
Ranked #3 of 16 lakes in Warren County
Nearby Lakes in Warren County
Explore Sherwood Lake Nr. Dam across LakeGrade
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Mesotrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Sherwood Lake Nr. Dam is a man-made reservoir impounded by the Lake Sherwood Dam (completed 1967), built primarily for recreation on the WOLF CREEK; earth-type dam, 67 ft tall and 1,000 ft long.
- Surface area
- 145 ac
- Normal storage
- 2,982 ac-ft
- Max storage
- 4,004 ac-ft
- Drainage area
- 4.59 sq mi
- Hazard class
- High
- Owner
- LAKE SHERWOOD ESTATES
Source: USACE National Inventory of Dams, NID ID MO10202 · Operator website · Matched by proximity (0.11 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of Sherwood Lake Nr. Dam under Clean Water Act (NPDES) discharge permits. 6 facilities have a reported Clean Water Act violation in the past three years.
- Lake Sherwood Estates Subdivision WwtpLake Sherwood · 0.1 mi away · NPDES MO0091529Recent violation
- Emmaus Homes, Inc. WwtfMarthasville · 1.3 mi away · NPDES MO0103535Recent violation
- Warco Manufacturing Company IncMarthasville · 3 mi away · NPDES MO0110086Recent violation
- Sccpwsd#2, Dakota Boys Ranch WwtpDutzow · 3.9 mi away · NPDES MO0111279Recent violation
- Sccpwsd#2, Dutzow WwtfDutzow · 4.3 mi away · NPDES MO0135755Recent violation
- Marthasville WwtfMarthasville · 4.5 mi away · NPDES MO0044113Recent 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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-14
Monitoring stations: 1