Poll Miller Park Lake
Lee County, Iowa15 acresView mapDirections
Iowa DNR publishes the water-quality measurements for Poll Miller Park Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Poll Miller Park Lake in Lee County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Water clarity: 5.9 ft visibility. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 7.7 µg/L. Surface area: 15.2 acres.
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. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-16. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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.
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.
Whether Poll Miller Park Lake is safe to swim in today is a call for the Iowa Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Poll Miller Park Lake
These are the measurements Iowa DNR publishes for Poll Miller Park 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 5.9 ft. Phosphorus 28 µg/L. Chlorophyll-a 7.7 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 28µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 7.7µg/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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Poll Miller Park Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (73°F) to its warmest (82°F).
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
Surface area
15 acres
No bathymetric survey has been published for Poll Miller Park Lake, so its depth is not documented here.
Stays via Stay22
Stays near Poll Miller Park Lake
Compare lakeside cabins, hotels, and vacation rentals near Poll Miller Park Lake in Lee County, Iowa — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Poll Miller Park Lake
Prices for Oct 23–25, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Iowa’s top lakes →
Follow Poll Miller Park Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Poll Miller Park Lake
Water Quality Trend: Worsening
Based on 4 years of monitoring (2021–2024).
Water clarity
Worsening4 years
Phosphorus
Worsening+28.3 µg/L/yr4 years
Chlorophyll-a
Worsening+0.42 µg/L/yr4 years
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
Designated uses not supporting: Recreation.
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.
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. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.
What is the water quality of Poll Miller Park Lake?
- Poll Miller Park Lake in Lee County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. 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 is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Poll Miller Park Lake is safe to swim in today is a call for Iowa's water agency and the county health department; check their current beach 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 lakes in Iowa
Other 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)
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)