Crowder S.P. Lake is a 22-acre highly nutrient-loaded hypereutrophic lake in Grundy County, Missouri. Water quality is graded F based on 3 sampling years through 2021.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-09-02. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1 ft of visibility. Phosphorus level: 110 µg/L. Chlorophyll-a: 176.4 µg/L. Trophic State Index: 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | F |
| Phosphorus | 110 µg/L | F |
| Chlorophyll-a (Algae) | 176.4 µg/L | F |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 22 acres |
Where to stay near Crowder S.P. Lake
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Fishing Crowder S.P. Lake
Location
County Ranking
Ranked #1 of 1 lakes in Grundy County
Cleaner Lakes Within 30 Miles
Crowder S.P. Lake holds Grade F. 5 nearby lakes hold higher grades.
- BNorth Bethany City ReservoirHarrison County · 24.7 mi · Two grade letters higher (F → B)
- BLake MarieMercer County · 27.7 mi · Two grade letters higher (F → B)
- DIndian Creek LakeLivingston County · 13.7 mi · Higher grade (F → D)
- DJamesport City LakeDaviess County · 10.7 mi · Higher grade (F → D)
- DLake PahoMercer County · 21.2 mi · Higher grade (F → D)
Nearby Lakes in Grundy County
Explore Crowder S.P. Lake across LakeGrade
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Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Other Grade F Lakes in Missouri
Daviess County · Clarity: 0.9 ft
Harrison County · Clarity: 1.5 ft
Sullivan County · Clarity: 2.7 ft
DeKalb County · Clarity: 1.9 ft
DeKalb County · Clarity: 1.6 ft
Putnam County · Clarity: 1.6 ft
Hypereutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Crowder S.P. Lake is a man-made reservoir impounded by the Crowder Dam (completed 1941), built primarily for recreation on the TR-THOMPSON RIVER; earth-type dam, 28 ft tall.
- Surface area
- 22 ac
- Normal storage
- 235 ac-ft
- Max storage
- 330 ac-ft
- Drainage area
- 900 sq mi
- Hazard class
- Low
- Owner
- MO. DNR PARKS
Source: USACE National Inventory of Dams, NID ID MO10378 · Operator website · Matched by proximity (0.18 km)
EPA Impairment Status
Crowder S.P. 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_7135.00 · Official waterbody report · Matched by proximity (0.01 km)
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Crowder S.P. Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Trenton Municipal Utilities WwtpTrenton · 4.4 mi away · NPDES MO0039748MajorRecent violation
- Mo Dept Natural ResourcesTrenton · 0.6 mi away · NPDES MO0034517
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)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-09-02
Monitoring stations: 1