Weatherby Lake is a 186-acre mesotrophic lake in Platte County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 2 other monitored lakes in Platte County, Weatherby Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-20. Grade methodology: LakeGrade methodology.
Watch Weatherby 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 6.2 ft. Phosphorus level: 16 µg/L. Chlorophyll-a: 5.9 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.2 ft | D |
| Phosphorus | 16 µg/L | A |
| Chlorophyll-a (Algae) | 5.9 µg/L | B |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 186 acres |
Where to stay near Weatherby Lake
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Fishing Weatherby Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.053 m/yr | 4 |
| Phosphorus | → Stable | +0.07 µg/L/yr | 4 |
| Chlorophyll-a | → Stable | +0.01 µg/L/yr | 4 |
Water Temperature
Weatherby Lake averages about 81°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in Apr (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 96 field readings (2010–2024) via the EPA Water Quality Portal. See the full Weatherby Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 3 lakes in Platte County
Nearby Lakes in Platte County
Explore Weatherby 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)
Weatherby Lake is a man-made reservoir impounded by the Weatherby Lake Dam (completed 1936), built primarily for recreation on the RUSH CREEK; earth-type dam, 85 ft tall and 1,100 ft long.
- Surface area
- 186 ac
- Normal storage
- 4,910 ac-ft
- Max storage
- 5,750 ac-ft
- Drainage area
- 4.3 sq mi
- Hazard class
- High
- Owner
- WEATHERBY LAKE IMPROVEMN
Source: USACE National Inventory of Dams, NID ID MO10690 · Operator website
EPA Impairment Status
Weatherby 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_7071.00 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
16 EPA-permitted facilities operate within about 5 miles of Weatherby Lake under Clean Water Act (NPDES) discharge permits, including 3 classified by the EPA as major dischargers. 4 facilities have a reported Clean Water Act violation in the past three years.
- Pcrsd Brush Creek WwtpParkville · 3.9 mi away · NPDES MO0119474MajorRecent violation
- Kansas City International AirportKansas City · 4.8 mi away · NPDES MO0114812MajorRecent violation
- Kansas City International Airport Mci MbKansas City · 4.5 mi away · NPDES MO0003263Major
- Parkville Extended Aeration WwtfParkville · 2.8 mi away · NPDES MO0113085Recent violation
- Heartland Presbyterian Center WwtfParkville · 4.2 mi away · NPDES MO0129534Recent violation
- Union Chapel Elementary SchoolParkville · 1.9 mi away · NPDES MO0085413
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: 2024-09-20
Monitoring stations: 1