Harrisonville Lake is a 398-acre highly nutrient-loaded hypereutrophic lake in Cass County, Missouri. Water quality is graded F based on 3 sampling years through 2023. Compared to the 4 other monitored lakes in Cass County, Harrisonville Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2023-07-28. Grade methodology: LakeGrade methodology.
Watch Harrisonville Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.1 ft of visibility. Phosphorus level: 69 µg/L. Chlorophyll-a: 66 µg/L. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | F |
| Phosphorus | 69 µg/L | D |
| Chlorophyll-a (Algae) | 66 µg/L | F |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 398 acres |
Where to stay near Harrisonville Lake
Compare lakeside cabins, hotels, and vacation rentals near Harrisonville Lake in Cass 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.
Top-rated places to stay near Harrisonville Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Harrisonville Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Harrisonville Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Missouri’s top lakes →
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.
Water Temperature
Harrisonville Lake averages about 85°F at the surface in summer, 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 →
Location
County Ranking
Ranked #3 of 5 lakes in Cass County
Nearby Lakes in Cass County
Explore Harrisonville Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
Hypereutrophic Lakes in Missouri
More records, surveys & data sources
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)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
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.
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
Most recent sample: 2023-07-28
Monitoring stations: 1