Poll Miller Park Lake is a 15-acre productive, nutrient-rich eutrophic lake in Lee County, Iowa. Water quality is graded C based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-16. Grade methodology: LakeGrade methodology.
Watch Poll Miller Park Lake water quality
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Swimming Safety
Based on E. coli testing, Poll Miller Park Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 6 samples across 2 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Iowa’s current beach and health-department advisories before swimming.
Water Quality Grade: C, Fair
Murky, only visible to about 5.9 ft. Chlorophyll-a: 7.7 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 7.7 µg/L | B |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15 acres |
Where to stay near Poll Miller Park Lake
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Fishing Poll Miller Park Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.067 m/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.42 µg/L/yr | 4 |
Water Temperature
Poll Miller Park Lake averages about 78°F at the surface in summer, usually warmest in Jul (about 82°F) and coldest in May (about 73°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 26 field readings (2010–2023) via the EPA Water Quality Portal. See the full Poll Miller Park Lake water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Poll Miller Park Lake, reaching a maximum surveyed depth of 26 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
County Ranking
Ranked #1 of 1 lakes in Lee County
Cleaner Lakes Within 30 Miles
Poll Miller Park Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Lee County
Explore Poll Miller 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)
Poll Miller Park Lake is a man-made reservoir impounded by the Pollmiller Park Dam (completed 1971), built primarily for recreation on the TR-PITTMAN CREEK; earth-type dam, 31 ft tall and 450 ft long.
- Surface area
- 15.2 ac
- Normal storage
- 190 ac-ft
- Max storage
- 243 ac-ft
- Drainage area
- 0.39 sq mi
- Hazard class
- Low
- Owner
- Lee County Conservation Board
Source: USACE National Inventory of Dams, NID ID IA00581 · Operator website
EPA Impairment Status
Poll Miller Park Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IA 03-SKM-888 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Poll Miller Park Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- West Point City Of StpWest Point · 0.7 mi away · NPDES IA0043109Recent 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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-16
Monitoring stations: 1