Robin Hood Lake is a 9-acre productive, nutrient-rich eutrophic lake in Warren County, Missouri. Water quality is graded D based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Robin Hood Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 3 ft of visibility. Phosphorus level: 58 µg/L. Chlorophyll-a: 20.7 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | 58 µg/L | C |
| Chlorophyll-a (Algae) | 20.7 µg/L | D |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 9 acres |
Where to stay near Robin Hood Lake
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Fishing Robin Hood Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.062 m/yr | 5 |
| Phosphorus | ↓ Declining | +6.52 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.46 µg/L/yr | 5 |
Water Temperature
Robin Hood Lake averages about 81°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in Apr (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 93 field readings (2010–2024) via the EPA Water Quality Portal. See the full Robin Hood Lake water temperature breakdown →
Location
County Ranking
Ranked #16 of 16 lakes in Warren County
Cleaner Lakes Within 30 Miles
Robin Hood Lake holds Grade D. 5 nearby lakes hold higher grades.
- BSherwood Lake Nr. DamWarren County · 0.6 mi · Two grade letters higher (D → B)
- BSherwood LakeWarren County · 1 mi · Two grade letters higher (D → B)
- CAspen Lake Along Southern ArmWarren County · 6.3 mi · Higher grade (D → C)
- DRobin Hood LakesWarren County · 0 mi · Higher overall water quality score
- DSugar Hollow LakeWarren County · 0.5 mi · Higher overall water quality score
Nearby Lakes in Warren County
Explore Robin Hood Lake across LakeGrade
More Missouri Lake Rankings
Other Grade D Lakes in Missouri
St. Charles County · Clarity: 2.1 ft
St. Charles County · Clarity: 3.3 ft
St. Charles County · Clarity: 2.6 ft
St. Charles County · Clarity: 3.2 ft
St. Charles County · Clarity: 2.7 ft
Franklin County · Clarity: 2.6 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Robin Hood Lake is a man-made reservoir impounded by the Lake Robin Hood Dam (completed 1970), built primarily for recreation on the TR-WOLF CREEK; earth-type dam, 34 ft tall.
- Surface area
- 9 ac
- Normal storage
- 78 ac-ft
- Max storage
- 164 ac-ft
- Drainage area
- 460 sq mi
- Hazard class
- Low
- Owner
- LK SHERWOOD ESTATES HOA
Source: USACE National Inventory of Dams, NID ID MO10447 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-14
Monitoring stations: 1