Harrisonville City Lake
Cass County, Missouri21 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Algal growth
- #2 of 4 in the county
Harrisonville City Lake in Cass County, Missouri has a water quality grade of F (Algae-prone). Water clarity: 1.9 ft visibility. Phosphorus: 78.5 µg/L. Chlorophyll-a (algae): 48.4 µg/L. Surface area: 21 acres.
- Clarity
- 1.9 ft
- Typical in August
- 81°F
- Area
- 21 acres
- Type
- Hypereutrophic
- Phosphorus
- 78.5 µg/L
- Chlorophyll-a
- 48.4 µg/L
- Trend
- ↑ Improving
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Stays 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Harrisonville City Lake are listed below.
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Watch Harrisonville City Lake’s letter
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Harrisonville City Lake is a 21-acre highly nutrient-loaded hypereutrophic lake in Cass County, Missouri. Water quality is graded F based on 2 sampling years through 2021. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Cass County, Harrisonville City Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-08-04. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Harrisonville City Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 1.9 ft of visibility. Phosphorus 78.5 µg/L. Chlorophyll-a 48.4 µg/L. TSI 68. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft | Not graded |
| Phosphorus | 78.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 48.4 µg/L | Poor |
| Trophic State Index (TSI) | 68 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Harrisonville City Lake typically sits around 81°F at the surface in August. Summer average is about 81°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 21 acres |
No bathymetric survey has been published for Harrisonville City Lake, so its depth is not documented here.
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 |
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)
County Ranking
Ranked #2 of 4 lakes in Cass County
Nearby Lakes in Cass County
Frequently asked questions about Harrisonville City Lake
Where is Harrisonville City Lake?
- Harrisonville City Lake is a lake in Cass County, Missouri. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Harrisonville City Lake?
- Harrisonville City Lake in Cass County, Missouri has a water quality grade of F (Algae-prone). Water clarity: 1.9 ft visibility. Phosphorus: 78.5 µg/L. Chlorophyll-a (algae): 48.4 µg/L. Surface area: 21 acres.
Is Harrisonville City Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Harrisonville City 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 City Lake?
- Harrisonville City Lake typically sits around 81°F at the surface in August, from 14 EPA Water Quality Portal field readings (2018–2021). That is a typical value for the month, not a live reading.
Explore Harrisonville City Lake across LakeQuality
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
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Where this data comes from
40 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC40 samples · 2020–2021
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 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