Kent Park Lake is a 29-acre productive, nutrient-rich eutrophic lake in Johnson County, Iowa. Water quality is graded C based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 2 other monitored lakes in Johnson County, Kent Park Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-08-26. Grade methodology: LakeGrade methodology.
Watch Kent Park Lake water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.8 ft. Chlorophyll-a: 11.8 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 11.8 µg/L | C |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 29 acres |
Where to stay near Kent Park Lake
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Fishing Kent Park Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.189 m/yr | 5 |
| Chlorophyll-a | ↑ Improving | -1.42 µg/L/yr | 5 |
Water Temperature
Kent Park Lake averages about 80°F at the surface in summer, usually warmest in Jul (about 81°F) and coldest in Sep (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 29 field readings (2010–2023) via the EPA Water Quality Portal. See the full Kent Park Lake water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Kent Park Lake, reaching a maximum surveyed depth of 16 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
County Ranking
Ranked #1 of 3 lakes in Johnson County
Nearby Lakes in Johnson County
Explore Kent Park Lake across LakeGrade
More Iowa Lake Rankings
Other Grade C Lakes in Iowa
Eutrophic Lakes in Iowa
More records, surveys & data sources
Reservoir Info (USACE NID)
Kent Park Lake is a man-made reservoir impounded by the F.W.Kent Park Dam (completed 1972), built primarily for recreation on the TR-CLEAR CREEK; earth-type dam, 34 ft tall and 850 ft long.
- Surface area
- 28.7 ac
- Normal storage
- 224 ac-ft
- Max storage
- 336 ac-ft
- Drainage area
- 1.09 sq mi
- Hazard class
- Low
- Owner
- Johnson County Conservation Board
Source: USACE National Inventory of Dams, NID ID IA01324 · Operator website · Matched by proximity (0.07 km)
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Kent Park Lake under Clean Water Act (NPDES) discharge permits. 5 facilities have a reported Clean Water Act violation in the past three years.
- Parkview Mobile Home CourtOxford · 1.1 mi away · NPDES IA0068349Recent violation
- Oxford City Of StpOxford · 2.8 mi away · NPDES IA0032531Recent violation
- Oxford Water Treatment PlantOxford · 3.6 mi away · NPDES IA0082252Recent violation
- Tiffin City Of StpTiffin · 4 mi away · NPDES IA0036617Recent violation
- Beyonder Getaway At Sleepy HollowOxford · 4.4 mi away · NPDES IA0069094Recent 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)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-08-26
Monitoring stations: 1