Brookfield Lake
Linn County, Missouri106 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Brookfield Lake. Here is what has been measured.
- Mesotrophic
- 45 ft max depth
- Public access
Brookfield Lake in Linn County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 4.4 ft visibility. Phosphorus: 19.7 µg/L. Chlorophyll-a (algae): 4.9 µg/L. Surface area: 106 acres.
Brookfield Lake is a 106-acre mesotrophic lake in Linn County, Missouri with an estimated average depth of about 45 feet. Phosphorus level is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 2 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Brookfield Lake is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Brookfield Lake
These are the measurements Missouri DNR publishes for Brookfield Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.4 ft. Phosphorus 19.7 µg/L. Chlorophyll-a 4.9 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 19.7µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 4.9µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 50 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Brookfield Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Brookfield Lake typically sits around 76°F at the surface in September. Summer average is about 81°F. Usually warmest in Jul (about 83°F) and coldest in May (about 70°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (70°F) to its warmest (83°F).
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 →
Lake Details
Max depth
~45 ft est.
Surface area
106 acres
Public access
Yes
Listed by Missouri DNR
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Brookfield Lake.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.2 mi
HydroLAKES / HydroSHEDS
Elevation
801 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Brookfield Lake
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Fishing Brookfield Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable4 years
Phosphorus
Worsening+1.52 µg/L/yr5 years
Chlorophyll-a
Improving-0.67 µg/L/yr5 years
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
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.
Nearby Lakes in Linn County
Frequently asked questions about Brookfield Lake
Where is Brookfield Lake?
- Brookfield Lake is a lake in Linn County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Brookfield Lake?
- Brookfield Lake in Linn County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 4.4 ft visibility. Phosphorus: 19.7 µg/L. Chlorophyll-a (algae): 4.9 µg/L. Surface area: 106 acres.
Is Brookfield Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Brookfield Lake?
- Brookfield Lake typically sits around 76°F at the surface in September, from 60 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Brookfield Lake?
- No published bathymetric survey covers Brookfield Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 45 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 106 acres.
Can I fish at Brookfield Lake?
- Public access to Brookfield Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Missouri's fish and wildlife agency, so check its current regulations before you go.
Explore Brookfield Lake across LakeQuality
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Where this data comes from
88 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC88 samples · 2020–2024
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)