Raintree Lake is a 475-acre productive, nutrient-rich eutrophic lake in Cass County, Missouri. Water quality is graded F based on 3 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Cass County, Raintree Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2023-09-17. Grade methodology: LakeGrade methodology.
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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 2.5 ft of visibility. Phosphorus level: 66.4 µg/L. Chlorophyll-a: 34.5 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | 66.4 µg/L | D |
| Chlorophyll-a (Algae) | 34.5 µg/L | F |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 475 acres |
Where to stay near Raintree Lake
Compare lakeside cabins, hotels, and vacation rentals near Raintree 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.
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Fishing Raintree Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.129 m/yr | 4 |
| Phosphorus | ↑ Improving | -3.76 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -9.89 µg/L/yr | 4 |
Water Temperature
Raintree Lake averages about 83°F at the surface in summer, usually warmest in Jul (about 86°F) and coldest in May (about 71°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 56 field readings (2010–2023) via the EPA Water Quality Portal. See the full Raintree Lake water temperature breakdown →
Location
County Ranking
Ranked #2 of 5 lakes in Cass County
Nearby Lakes in Cass County
Explore Raintree 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)
Raintree Lake is a man-made reservoir impounded by the Raintree Lake Dam (completed 1974), built primarily for recreation on the MIDDLE BIG CREEK; earth-type dam, 55 ft tall and 1,900 ft long.
- Surface area
- 475 ac
- Normal storage
- 3,570 ac-ft
- Max storage
- 7,220 ac-ft
- Drainage area
- 7.45 sq mi
- Hazard class
- High
- Owner
- RAINTREE LAKE DEV CORP
Source: USACE National Inventory of Dams, NID ID MO20388 · Operator website
EPA Impairment Status
Raintree 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_7213.00 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Raintree Lake under Clean Water Act (NPDES) discharge permits.
- Redford Construction WwtfPleasant Hill · 2.1 mi away · NPDES MO0135488
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-17
Monitoring stations: 1