Crowder S.P. Lake
Grundy County, Missouri22 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Mercury
- Limited data
Crowder S.P. Lake in Grundy County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Phosphorus: 110 µg/L. Chlorophyll-a (algae): 176.4 µg/L. Surface area: 22 acres.
- Clarity
- 1 ft
- Area
- 22 acres
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Watch Crowder S.P. Lake’s letter
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Why Crowder S.P. Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Crowder S.P. Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is 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.
Water quality measurements for Crowder S.P. Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1 ft of visibility. Phosphorus 110 µg/L. Chlorophyll-a 176.4 µg/L. TSI 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | 110 µg/L | Not graded |
| Chlorophyll-a (Algae) | 176.4 µg/L | Not graded |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 22 acres |
No bathymetric survey has been published for Crowder S.P. Lake, so its depth is not documented here.
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
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.
Graded lakes near Crowder S.P. Lake
Crowder S.P. Lake has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Crowder S.P. Lake?
- Crowder S.P. Lake in Grundy County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- The letter is 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.
Explore Crowder S.P. Lake across LakeQuality
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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)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)