Harrisonville City Lake
Cass County, Missouri21 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Harrisonville City Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · Algal growth
Harrisonville City Lake in Cass County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1.9 ft visibility. Phosphorus: 78.5 µg/L. Chlorophyll-a (algae): 48.4 µg/L. Surface area: 21 acres.
Harrisonville City Lake is a 21-acre highly nutrient-loaded hypereutrophic lake in Cass County, Missouri. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are 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.
Whether Harrisonville City 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 City Lake
These are the measurements Missouri DNR publishes for Harrisonville City 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 1.9 ft of visibility. Phosphorus 78.5 µg/L. Chlorophyll-a 48.4 µg/L. TSI 68.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 78.5µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 48.4µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 68 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Harrisonville City Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (78°F) to its warmest (85°F).
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
Surface area
21 acres
No bathymetric survey has been published for Harrisonville City Lake, so its depth is not documented here.
Stays via Stay22
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 readings cover nutrients and algae, not lodging. Cabins and rentals around Harrisonville City Lake are listed below.
Top-rated places to stay near Harrisonville City Lake
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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 whole trip? See where to stay at Missouri’s top lakes →
Follow Harrisonville City Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Harrisonville City Lake
Water quality readings over time
2 seasons of samples on record (2020–2021). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Improving-18 µg/L/yr2 years
Chlorophyll-a
Improving-19.8 µg/L/yr2 years
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
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit MO_7217.00 · Official waterbody report
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. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Harrisonville City Lake?
- Harrisonville City Lake in Cass County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. 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?
- Nutrient and algae readings are 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
More lakes in Missouri
Other Lakes in Missouri
Hypereutrophic Lakes in Missouri
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)
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