Lake Luna
Cass County, Missouri17 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Algal growth
- #3 of 4 in the county
Lake Luna in Cass County, Missouri has a water quality grade of F (Algae-prone). Water clarity: 1.2 ft visibility. Phosphorus: 192.9 µg/L. Chlorophyll-a (algae): 92.7 µg/L. Surface area: 17 acres.
- Clarity
- 1.2 ft
- Typical in August
- 83°F
- Area
- 17 acres
- Type
- Hypereutrophic
- Phosphorus
- 192.9 µg/L
- Chlorophyll-a
- 92.7 µg/L
- Trend
- ↑ Improving
Stays via Stay22
Stays near Lake Luna
Compare lakeside cabins, hotels, and vacation rentals near Lake Luna 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 Lake Luna are listed below.
Top-rated places to stay near Lake Luna
Prices for Sep 11–13, 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 →
Watch Lake Luna’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Lake Luna is a 17-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, Lake Luna ranks #3 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. Lake Luna 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 1.2 ft of visibility. Phosphorus 192.9 µg/L. Chlorophyll-a 92.7 µg/L. TSI 77. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | Not graded |
| Phosphorus | 192.9 µg/L | Poor |
| Chlorophyll-a (Algae) | 92.7 µg/L | Poor |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Lake Luna typically sits around 83°F at the surface in August. Summer average is about 82°F. Usually warmest in Jul (about 84°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 12 field readings (2019–2021) via the EPA Water Quality Portal. See the full Lake Luna water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 17 acres |
No bathymetric survey has been published for Lake Luna, so its depth is not documented here.
Fishing Lake Luna
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)
Lake Luna is a man-made reservoir impounded by the Lake Luna Dam (completed 1920), built primarily for recreation on the TOWN CREEK; earth-type dam, 17 ft tall.
- Surface area
- 17 ac
- Normal storage
- 120 ac-ft
- Max storage
- 155 ac-ft
- Drainage area
- 1,310 sq mi
- Hazard class
- High
- Owner
- CITY OF HARRISONVILLE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO20076 · Operator website
EPA Impairment Status
Lake Luna 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_7216.00 · Official waterbody report
Regulated Pollution Sources Nearby
11 EPA-permitted facilities operate within about 5 miles of Lake Luna under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 6 facilities have a reported Clean Water Act violation in the past three years.
- Harrisonville WwtpHarrisonville · 1.7 mi away · NPDES MO0028070MajorRecent violation
- Harrisonville Fireworks LpHarrisonville · 3.1 mi away · NPDES MO0123595Recent violation
- Grab And Go WwtpHarrisonville · 3.1 mi away · NPDES MO0117544Recent violation
- Slumber Inn WwtfHarrisonville · 3.1 mi away · NPDES MO0107301Recent violation
- Sapp Brothers Travel Center WwtpHarrisonville · 3.3 mi away · NPDES MO0138215Recent violation
- Harrisonville South WwtpHarrisonville · 3.8 mi away · NPDES MO0126179Recent violation
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.
County Ranking
Ranked #3 of 4 lakes in Cass County
Nearby Lakes in Cass County
Frequently asked questions about Lake Luna
Where is Lake Luna?
- Lake Luna 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 Lake Luna?
- Lake Luna in Cass County, Missouri has a water quality grade of F (Algae-prone). Water clarity: 1.2 ft visibility. Phosphorus: 192.9 µg/L. Chlorophyll-a (algae): 92.7 µg/L. Surface area: 17 acres.
Is Lake Luna safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Lake Luna 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 Lake Luna?
- Lake Luna typically sits around 83°F at the surface in August, from 12 EPA Water Quality Portal field readings (2019–2021). That is a typical value for the month, not a live reading.
Explore Lake Luna 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
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade F 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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)