Brookfield Lake is a 106-acre mesotrophic lake in Linn County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Phosphorus level is declining over recent sampling years. Limited fish-species data available. Public access is available with 3 public boat landings. Compared to the 3 other monitored lakes in Linn County, Brookfield Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-07. Grade methodology: LakeGrade methodology.
Watch Brookfield Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 4.4 ft. Phosphorus level: 19.7 µg/L. Chlorophyll-a: 4.9 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.4 ft | D |
| Phosphorus | 19.7 µg/L | A |
| Chlorophyll-a (Algae) | 4.9 µg/L | A |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 106 acres |
| Public Access | Yes |
Where to stay near Brookfield Lake
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Fishing Brookfield Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.025 m/yr | 4 |
| Phosphorus | ↓ Declining | +1.52 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.67 µg/L/yr | 5 |
Recreation & Access
Water Temperature
Brookfield Lake averages about 81°F at the surface in summer, usually warmest in Jul (about 83°F) and coldest in May (about 70°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 60 field readings (2010–2024) via the EPA Water Quality Portal. See the full Brookfield Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 4 lakes in Linn County
Cleaner Lakes Within 30 Miles
Brookfield Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Linn County
Explore Brookfield Lake across LakeGrade
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Mesotrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Brookfield Lake is a man-made reservoir impounded by the Brookfield Dam (completed 1959), built primarily for water supply on the TR WEST YELLOW CREEK; earth-type dam, 43 ft tall and 1,350 ft long.
- Surface area
- 106 ac
- Normal storage
- 1,365 ac-ft
- Max storage
- 1,775 ac-ft
- Drainage area
- 1.03 sq mi
- Hazard class
- High
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID MO10181 · Operator website
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
9 EPA-permitted facilities operate within about 5 miles of Brookfield Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Brookfield WwtpBrookfield · 2.1 mi away · NPDES MO0137553Major
- Brookfield Country Club WwtfBrookfield · 0.7 mi away · NPDES MO0138339Recent violation
- Eastside Property Owners Assn WwtfBrookfield · 0.5 mi away · NPDES MO0122301
- Brookfield Country Club WwtfBrookfield · 0.7 mi away · NPDES MO0127469
- Brookfield Northeast WwtfBrookfield · 1.5 mi away · NPDES MO0028746
- Brookfield Swimming Pool WwtfBrookfield · 3.1 mi away · NPDES MO0046922
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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2024-08-07
Monitoring stations: 1