Lake Miami Max Depth is a 140-acre highly nutrient-loaded hypereutrophic lake in Monroe County, Iowa. Water quality is graded F based on 2 sampling years through 2024. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-17. Grade methodology: LakeGrade methodology.
Watch Lake Miami Max Depth water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.3 ft of visibility. Chlorophyll-a: 58.6 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 58.6 µg/L | F |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 140 acres |
| Public Access | Yes |
Where to stay near Lake Miami Max Depth
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Fishing Lake Miami Max Depth
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.005 m/yr | 5 |
| Chlorophyll-a | → Stable | +0.34 µg/L/yr | 5 |
Recreation & Access
Water Temperature
Lake Miami Max Depth averages about 79°F at the surface in summer, usually warmest in Jul (about 84°F) and coldest in May (about 72°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 Lake Miami Max Depth water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Lake Miami Max Depth, 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 1 lakes in Monroe County
Cleaner Lakes Within 30 Miles
Lake Miami Max Depth holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Monroe County
Explore Lake Miami Max Depth across LakeGrade
More Iowa Lake Rankings
Other Grade F Lakes in Iowa
Hypereutrophic Lakes in Iowa
More records, surveys & data sources
Reservoir Info (USACE NID)
Lake Miami Max Depth is a man-made reservoir impounded by the Lake Miami Dam (completed 1966), built primarily for recreation on the TR-BLUFF CREEK; earth-type dam, 32 ft tall and 1,178 ft long.
- Surface area
- 140 ac
- Normal storage
- 1,720 ac-ft
- Max storage
- 2,300 ac-ft
- Drainage area
- 6.09 sq mi
- Hazard class
- Significant
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA00807 · Operator website · Matched by proximity (0.12 km)
EPA Impairment Status
Lake Miami Max Depth 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-1016 · Official waterbody report · Matched by proximity (0.82 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: 2024-09-17
Monitoring stations: 1