Harrisonville Lake
Cass County, Missouri398 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Harrisonville Lake. Here is what has been measured.
- Impaired · Algal growth
- 56 ft max depth
- Limited data
Harrisonville Lake in Cass County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1.1 ft visibility. Phosphorus: 69 µg/L. Chlorophyll-a (algae): 66 µg/L. Surface area: 398 acres.
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. Methodology: how these readings are compared.
Harrisonville Lake covers about 400 acres in Cass County. Vrbo is where to look for cabins and lake homes around Harrisonville Lake, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
No readingLimited data
Nutrient and algae readings are 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.
Whether Harrisonville 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 Harrisonville Lake
These are the measurements Missouri DNR publishes for Harrisonville 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 1.1 ft of visibility. Phosphorus 69 µg/L. Chlorophyll-a 66 µg/L. TSI 71.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 69µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 66µg/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. | 71 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Harrisonville Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (68°F) to its warmest (88°F).
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
Max depth
~56 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
Watershed (drainage) area
15 sq mi
HydroLAKES / HydroSHEDS
Shoreline
7 mi
HydroLAKES / HydroSHEDS
Elevation
906 ft
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.
Stays via Stay22
Stays near Harrisonville Lake
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Fishing Harrisonville Lake
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
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit MO_7214.00 · Official waterbody report
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.
Nearby Lakes in Cass County
Frequently asked questions about Harrisonville Lake
Where is Harrisonville Lake?
- Harrisonville Lake is a lake in Cass County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Harrisonville Lake?
- Harrisonville Lake in Cass County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. 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?
- Nutrient and algae readings are 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
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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)
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)