Crowder S.P. Lake
Grundy County, Missouri22 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Crowder S.P. Lake. Here is what has been measured.
- Impaired · Mercury
- Limited data
Crowder S.P. Lake in Grundy County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 110 µg/L. Chlorophyll-a (algae): 176.4 µg/L. Surface area: 22 acres.
Crowder S.P. Lake is a 22-acre lake in Grundy County, Missouri.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-09-02. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Crowder S.P. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Crowder S.P. Lake is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Crowder S.P. Lake
These are the measurements Missouri DNR publishes for Crowder S.P. Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. Phosphorus 110 µg/L. Chlorophyll-a 176.4 µg/L. TSI 77.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 110µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 176µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 77 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Crowder S.P. Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
22 acres
No bathymetric survey has been published for Crowder S.P. Lake, so its depth is not documented here.
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Fishing Crowder S.P. Lake
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
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit MO_7135.00 · Official waterbody report
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.
Nearby Lakes in Grundy County
Frequently asked questions about Crowder S.P. Lake
Where is Crowder S.P. Lake?
- Crowder S.P. Lake is a lake in Grundy County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Crowder S.P. Lake?
- Crowder S.P. Lake in Grundy County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 110 µg/L. Chlorophyll-a (algae): 176.4 µg/L. Surface area: 22 acres.
Is Crowder S.P. Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Crowder S.P. Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
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Where this data comes from
3 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Missouri Dept. of Natural Resources
MDNR3 samples · 2021
Analytical methods
- Depth, Secchi disk in meters
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)