Harrisonville City Lake is a 21-acre productive, nutrient-rich eutrophic lake in Cass County, Missouri. Water quality is graded F based on 3 sampling years through 2021. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Cass County, Harrisonville City Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-08-04. Grade methodology: LakeGrade methodology.
Watch Harrisonville City Lake water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.9 ft of visibility. Phosphorus level: 78.5 µg/L. Chlorophyll-a: 48.4 µg/L. Trophic State Index: 68.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft | F |
| Phosphorus | 78.5 µg/L | D |
| Chlorophyll-a (Algae) | 48.4 µg/L | F |
| Trophic State Index (TSI) | 68 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 21 acres |
Where to stay near Harrisonville City Lake
Compare lakeside cabins, hotels, and vacation rentals near Harrisonville City 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 City Lake
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Fishing Harrisonville City Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.08 m/yr | 2 |
| Phosphorus | ↑ Improving | -18 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -19.8 µg/L/yr | 2 |
Water Temperature
Harrisonville City Lake averages about 81°F at the surface in summer, usually warmest in Jul (about 85°F) and coldest in Jun (about 78°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 14 field readings (2018–2021) via the EPA Water Quality Portal. See the full Harrisonville City Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 5 lakes in Cass County
Nearby Lakes in Cass County
Explore Harrisonville City Lake across LakeGrade
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
Eutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Harrisonville City Lake is a man-made reservoir impounded by the City Lake Dam (completed 1934), built primarily for water supply on the TOWN CREEK; earth-type dam, 22 ft tall.
- Surface area
- 21 ac
- Normal storage
- 107 ac-ft
- Max storage
- 247 ac-ft
- Drainage area
- 461 sq mi
- Hazard class
- High
- Owner
- CITY OF HARRISONVILLE
Source: USACE National Inventory of Dams, NID ID MO20314 · Operator website · Matched by proximity (0.11 km)
EPA Impairment Status
Harrisonville City 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_7217.00 · Official waterbody report · Matched by proximity (0.3 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-08-04
Monitoring stations: 1