Harrisonville Lake
Cass County, Missouri398 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 · Algal growth
- a waterflea
- 56 ft max depth
- Limited data
Harrisonville Lake in Cass County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.1 ft visibility. Phosphorus: 69 µg/L. Chlorophyll-a (algae): 66 µg/L. Surface area: 398 acres.
- Clarity
- 1.1 ft
- Typical in July
- 88°F
- Max depth
- ~56 ft est.
- Area
- 398 acres
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Watch Harrisonville Lake’s letter
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Why Harrisonville 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 Harrisonville 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.
Harrisonville Lake is a 398-acre lake in Cass County, Missouri with an estimated average depth of about 56 feet.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2023-07-28. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Harrisonville Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water quality measurements for Harrisonville Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.1 ft of visibility. Phosphorus 69 µg/L. Chlorophyll-a 66 µg/L. TSI 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | Not graded |
| Phosphorus | 69 µg/L | Not graded |
| Chlorophyll-a (Algae) | 66 µg/L | Not graded |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Harrisonville Lake typically sits around 88°F at the surface in July. Summer average is about 85°F. Usually warmest in Jul (about 88°F) and coldest in May (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 9 field readings (2015–2023) via the EPA Water Quality Portal. See the full Harrisonville Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~56 ft est. |
| Average Depth | ~38 ft est. |
| Surface Area | 398 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Harrisonville Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Harrisonville Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Reservoir Info (USACE NID)
Harrisonville Lake is a man-made reservoir impounded by the Harrisonville City Lake Dam (completed 1971), built primarily for recreation on the TR MIDDLE BIG CREEK; earth-type dam, 55 ft tall and 1,900 ft long.
- Surface area
- 398 ac
- Normal storage
- 11,275 ac-ft
- Max storage
- 13,520 ac-ft
- Drainage area
- 14.8 sq mi
- Hazard class
- High
- Owner
- CITY OF HARRISONVILLE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO20077 · Operator website · Matched by proximity (0.29 km)
EPA Impairment Status
Harrisonville 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_7214.00 · Official waterbody report · Matched by proximity (1.38 km)
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Harrisonville Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Country Creek Estates WwtpPleasant Hill · 2 mi away · NPDES MO0112461Recent violation
- Dogwood Energy FacilityPleasant Hill · 2.4 mi away · NPDES MO0124940
- Lbvsd Middle Big Creek WwtpPleasant Hill · 3.6 mi away · NPDES MO0058629
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 Harrisonville Lake
Harrisonville Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cass County
Frequently asked questions about Harrisonville Lake
Where is Harrisonville Lake?
- Harrisonville Lake is a lake in Cass 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 Harrisonville Lake?
- Harrisonville Lake in Cass County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.1 ft visibility. Phosphorus: 69 µg/L. Chlorophyll-a (algae): 66 µg/L. Surface area: 398 acres.
Is Harrisonville Lake safe to swim in?
- The letter is not a swimming clearance. Harrisonville Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
What is the water temperature of Harrisonville Lake?
- Harrisonville Lake typically sits around 88°F at the surface in July, from 9 EPA Water Quality Portal field readings (2015–2023). That is a typical value for the month, not a live reading.
How deep is Harrisonville Lake?
- No published bathymetric survey covers Harrisonville Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 56 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 398 acres.
Explore Harrisonville Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Missouri's cleanest and most-polluted lakes, ranked
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Other Lakes in Missouri
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Where this data comes from
3 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Missouri Dept. of Natural Resources
MDNR3 samples · 2023
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)