Fawn Lake is a 25-acre productive, nutrient-rich eutrophic lake in Franklin County, Missouri. Water quality is graded C based on 3 sampling years through 2024. Compared to the 4 other monitored lakes in Franklin County, Fawn Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 3.6 ft. Phosphorus level: 30 µg/L. Chlorophyll-a: 10.8 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft | D |
| Phosphorus | 30 µg/L | C |
| Chlorophyll-a (Algae) | 10.8 µg/L | C |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
Where to stay near Fawn Lake
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Fishing Fawn Lake
Location
County Ranking
Ranked #3 of 5 lakes in Franklin County
Cleaner Lakes Within 30 Miles
Fawn Lake holds Grade C. 3 nearby lakes hold higher grades.
- BSherwood Lake Nr. DamWarren County · 14.5 mi · Higher grade (C → B)
- BSherwood LakeWarren County · 14.9 mi · Higher grade (C → B)
- CPort Hudson LakeFranklin County · 9.4 mi · Higher overall water quality score
Nearby Lakes in Franklin County
Explore Fawn Lake across LakeGrade
More Missouri Lake Rankings
Other Grade C Lakes in Missouri
Warren County · Clarity: 3.8 ft
Gasconade County · Clarity: 3.9 ft
Warren County · Clarity: 5.2 ft
Warren County · Clarity: 3.3 ft
Gasconade County · Clarity: 3.8 ft
Gasconade County · Clarity: 4 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Fawn Lake is a man-made reservoir impounded by the Fawn Lake Dam (completed 1969), built primarily for recreation on the TR TO ST JOHNS CR; earth-type dam, 43 ft tall and 650 ft long.
- Surface area
- 25 ac
- Normal storage
- 207 ac-ft
- Max storage
- 400 ac-ft
- Drainage area
- 0.91 sq mi
- Hazard class
- Significant
- Owner
- FAWN LAKE ESTATES
Source: USACE National Inventory of Dams, NID ID MO31253 · Operator website
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
17 EPA-permitted facilities operate within about 5 miles of Fawn Lake under Clean Water Act (NPDES) discharge permits. 12 facilities have a reported Clean Water Act violation in the past three years.
- Westview Mobile Home Park WwtpUnion · 1.9 mi away · NPDES MO0111902Recent violation
- Fcpwsd No. 1 Twin Lakes WwtpUnion · 2 mi away · NPDES MO0114189Recent violation
- Fcpwsd No.1 Baucky View Subd WwtpUnion · 2.4 mi away · NPDES MO0131431Recent violation
- Fcpwsd No. 1 Krakow Area WwtfWashington · 2.9 mi away · NPDES MO0126241Recent violation
- Countryside Mhp WwtpBeaufort · 3.1 mi away · NPDES MO0120014Recent violation
- Franklin County Industrial Park WwtpWashington · 3.5 mi away · NPDES MO0110787Recent 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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-20
Monitoring stations: 1