Hooper Pond Lake is a 45-acre productive, nutrient-rich eutrophic lake in Warren County, Iowa. Water quality is graded D based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Warren County, Hooper Pond Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.5 ft of visibility. Chlorophyll-a: 25.1 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 25.1 µg/L | D |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 45 acres |
| Public Access | Yes |
Where to stay near Hooper Pond Lake
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Fishing Hooper Pond Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.136 m/yr | 5 |
| Chlorophyll-a | ↑ Improving | -7.28 µg/L/yr | 5 |
Recreation & Access
Water Temperature
Hooper Pond Lake averages about 79°F at the surface in summer, usually warmest in Jul (about 82°F) and coldest in May (about 69°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 Hooper Pond Lake water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Hooper Pond Lake, reaching a maximum surveyed depth of 18 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
County Ranking
Ranked #1 of 2 lakes in Warren County
Cleaner Lakes Within 30 Miles
Hooper Pond Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Warren County
Explore Hooper Pond Lake across LakeGrade
More Iowa Lake Rankings
Other Grade D Lakes in Iowa
Eutrophic Lakes in Iowa
More records, surveys & data sources
Reservoir Info (USACE NID)
Hooper Pond Lake is a man-made reservoir impounded by the Hooper Dam (completed 1996), built primarily for recreation on the TR- SQUAW CREEK; earth-type dam, 37 ft tall and 900 ft long.
- Surface area
- 44.8 ac
- Normal storage
- 418 ac-ft
- Max storage
- 879 ac-ft
- Drainage area
- 2.23 sq mi
- Hazard class
- Significant
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA03101 · Operator website
EPA Impairment Status
Hooper Pond Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-LDM-1080 · Official waterbody report · Matched by proximity (1.12 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2024-09-18
Monitoring stations: 1