Poll Miller Park Lake
Lee County, Iowa15 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- Impaired · Mercury
- #1 of 1 in the county
Poll Miller Park Lake in Lee County, Iowa has a water quality grade of B (Good). Water clarity: 5.9 ft visibility. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 7.7 µg/L. Surface area: 15.2 acres.
- Clarity
- 5.9 ft
- Typical in September
- 76°F
- Area
- 15 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
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Watch Poll Miller Park Lake’s letter
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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.
Poll Miller Park Lake is a 15-acre productive, nutrient-rich eutrophic lake in Lee County, Iowa. Water quality is graded B 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: LakeQuality methodology.
Swimming Safety
Grade onlyBacteria A
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
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: B (Good)
Murky, only visible to about 5.9 ft. Phosphorus 28 µg/L. Chlorophyll-a 7.7 µg/L. TSI 51. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | Not graded |
| Phosphorus | 28 µg/L | Good |
| Chlorophyll-a (Algae) | 7.7 µg/L | Good |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Poll Miller Park Lake typically sits around 76°F at the surface in September. Summer average is about 78°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15 acres |
No bathymetric survey has been published for Poll Miller Park Lake, so its depth is not documented here.
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 |
| Phosphorus | ↓ Declining | +28.3 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.42 µg/L/yr | 4 |
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.
County Ranking
Ranked #1 of 1 lakes in Lee County
Nearby Lakes With Higher Grades
Poll Miller Park Lake holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Lee County
Frequently asked questions about Poll Miller Park Lake
Where is Poll Miller Park Lake?
- Poll Miller Park Lake is a lake in Lee County, Iowa. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Poll Miller Park Lake?
- Poll Miller Park Lake in Lee County, Iowa has a water quality grade of B (Good). Water clarity: 5.9 ft visibility. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 7.7 µg/L. Surface area: 15.2 acres.
Is Poll Miller Park Lake safe to swim in?
- 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. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Poll Miller Park Lake has a water quality grade of B (Good). Bacteria levels can spike quickly after heavy rain, so always check Iowa's current beach and health-department advisories before you swim.
What is the water temperature of Poll Miller Park Lake?
- Poll Miller Park Lake typically sits around 76°F at the surface in September, from 26 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
Explore Poll Miller Park Lake across LakeQuality
More Iowa Lake Rankings
Other Grade B Lakes in Iowa
Eutrophic Lakes in Iowa
Where this data comes from
54 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Iowa DNR Surface Water Monitoring Data
21IOWA_WQX54 samples · 2021–2024
Analytical methods
- Unknown
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- In-Vitro Determination of Chlorophyll
- ISU modification of APHA 2130-B
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)