Terry Trueblood Lake is a highly nutrient-loaded hypereutrophic lake in Johnson County, Iowa. Water quality is graded F 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 2 public boat landings. Compared to the 2 other monitored lakes in Johnson County, Terry Trueblood Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-10. Grade methodology: LakeGrade methodology.
Watch Terry Trueblood Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.1 ft of visibility. Chlorophyll-a: 54.9 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 54.9 µg/L | F |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Terry Trueblood Lake
Compare lakeside cabins, hotels, and vacation rentals near Terry Trueblood Lake in Johnson 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 Terry Trueblood Lake
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 trip to Terry Trueblood Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Terry Trueblood Lake — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Iowa’s top lakes →
Fishing Terry Trueblood Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.15 m/yr | 2 |
| Chlorophyll-a | ↑ Improving | -291.7 µg/L/yr | 2 |
Recreation & Access
Location
County Ranking
Ranked #3 of 3 lakes in Johnson County
Cleaner Lakes Within 30 Miles
Terry Trueblood Lake holds Grade F. 2 nearby lakes hold higher grades.
- CKent Park LakeJohnson County · 12.4 mi · Two grade letters higher (F → C)
- DLake MacbrideJohnson County · 12 mi · Higher grade (F → D)
Nearby Lakes in Johnson County
Explore Terry Trueblood Lake across LakeGrade
More Iowa Lake Rankings
Other Grade F Lakes in Iowa
Hypereutrophic Lakes in Iowa
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
21 EPA-permitted facilities operate within about 5 miles of Terry Trueblood Lake under Clean Water Act (NPDES) discharge permits, including 3 classified by the EPA as major dischargers. 11 facilities have a reported Clean Water Act violation in the past three years.
- Iowa City, City Of (South) StpIowa City · 1.6 mi away · NPDES IA0070866MajorRecent violation
- University Of Iowa Power PlantIowa City · 2.4 mi away · NPDES IA0003077MajorRecent violation
- Iowa City, City Of (North) StpIowa City · 1.7 mi away · NPDES IA0042617Major
- Lake RidgeIowa City · 0.9 mi away · NPDES IA0074284Recent violation
- Makada Subdivision-StpIowa City · 1.1 mi away · NPDES IA0073733Recent violation
- Iowa City Regency Mobile Home Park StpIowa City · 1.2 mi away · NPDES IA0063274Recent 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)
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: 2024-09-10
Monitoring stations: 1