Fox Valley Lake is a 96-acre mesotrophic lake in Clark County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Clark County, Fox Valley Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-07-31. Grade methodology: LakeGrade methodology.
Watch Fox Valley Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 8.5 ft. Phosphorus level: 16.5 µg/L. Chlorophyll-a: 3.6 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | C |
| Phosphorus | 16.5 µg/L | A |
| Chlorophyll-a (Algae) | 3.6 µg/L | A |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 96 acres |
| Public Access | Yes |
Where to stay near Fox Valley Lake
Compare lakeside cabins, hotels, and vacation rentals near Fox Valley Lake in Clark County, Missouri — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Fox Valley Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.628 m/yr | 4 |
| Phosphorus | ↓ Declining | +1.43 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.79 µg/L/yr | 5 |
Recreation & Access
Water Temperature
Fox Valley Lake averages about 82°F at the surface in summer, usually warmest in Jul (about 83°F) and coldest in May (about 72°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 62 field readings (2010–2024) via the EPA Water Quality Portal. See the full Fox Valley Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 2 lakes in Clark County
Nearby Lakes in Clark County
Explore Fox Valley Lake 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)
Fox Valley Lake is a man-made reservoir impounded by the Fox Valley Dam (completed 1983), built primarily for recreation on the FOX CREEK; earth-type dam, 52 ft tall and 1,000 ft long.
- Surface area
- 96 ac
- Normal storage
- 1,532 ac-ft
- Max storage
- 4,347 ac-ft
- Drainage area
- 1.79 sq mi
- Hazard class
- High
- Owner
- MO DEPT OF CONSERVATION
Source: USACE National Inventory of Dams, NID ID MO12197 · Operator website
EPA Impairment Status
Fox Valley Lake 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_7008.00 · Official waterbody report
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 Fox Valley Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Revere WwtfRevere · 4.7 mi away · NPDES MO0129674Recent 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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2024-07-31
Monitoring stations: 2