Okamanpeedan Lake
Emmet County, IowaView mapDirections
Iowa DNR publishes the water-quality measurements for Okamanpeedan Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · Algal growth
- 54 ft max depth
- Public access
- Limited data
Okamanpeedan Lake in Emmet County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 155 µg/L. Chlorophyll-a (algae): 63.2 µg/L.
Okamanpeedan Lake is a highly nutrient-loaded hypereutrophic lake in Emmet County, Iowa with an estimated average depth of about 54 feet. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Emmet County, Okamanpeedan Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2025-09-16. Methodology: how these readings are compared.
What Okamanpeedan Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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.
Nutrient and algae readings are not a swimming clearance. Okamanpeedan Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, turbidity. Check local advisories before you swim.
Whether Okamanpeedan 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 Okamanpeedan Lake
These are the measurements Iowa DNR publishes for Okamanpeedan Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. Phosphorus 155 µg/L. Chlorophyll-a 63.2 µg/L. TSI 75.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 155µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 63.2µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 75 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Okamanpeedan Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Okamanpeedan Lake typically sits around 63°F at the surface in September. Summer average is about 74°F. Usually warmest in Jul (about 77°F) and coldest in May (about 55°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (55°F) to its warmest (77°F).
Typical surface water temperature by month, from 13 field readings (2014–2014) via the EPA Water Quality Portal. See the full Okamanpeedan Lake water temperature breakdown →
Lake Details
Max depth
~54 ft est.
Public access
Yes
Listed by Iowa DNR
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Iowa has not published bathymetry for Okamanpeedan Lake.
Lake Size & Watershed
Watershed (drainage) area
178 sq mi
HydroLAKES / HydroSHEDS
Surface area
2,226 acres
HydroLAKES / HydroSHEDS
Shoreline
12.8 mi
HydroLAKES / HydroSHEDS
Elevation
1,220 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Tuttle Lake Wetland ComplexPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Okamanpeedan Lake
Compare lakeside cabins, hotels, and vacation rentals near Okamanpeedan Lake in Emmet 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Okamanpeedan Lake are listed below.
Top-rated places to stay near Okamanpeedan Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a trip? Cabins and lodging at Okamanpeedan Lake → · more Iowa lake trips
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Fishing Okamanpeedan Lake
EPA Impairment Status
Okamanpeedan Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-EDM-975 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Okamanpeedan Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Dolliver, City Of StpDolliver · 2.4 mi away · NPDES IA0082147Recent 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 Emmet County
Frequently asked questions about Okamanpeedan Lake
Where is Okamanpeedan Lake?
- Okamanpeedan Lake is a lake in Emmet County, Iowa. Its water-quality measurements are published by Iowa DNR and shown on this page as reported.
What is the water quality of Okamanpeedan Lake?
- Okamanpeedan Lake in Emmet County, Iowa has water-quality measurements published by Iowa DNR, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 155 µg/L. Chlorophyll-a (algae): 63.2 µg/L.
Is Okamanpeedan Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Okamanpeedan Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, turbidity. Check local advisories before you swim.
What is the water temperature of Okamanpeedan Lake?
- Okamanpeedan Lake typically sits around 63°F at the surface in September, from 13 EPA Water Quality Portal field readings (2014–2014). That is a typical value for the month, not a live reading.
How deep is Okamanpeedan Lake?
- No published bathymetric survey covers Okamanpeedan Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 54 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Okamanpeedan Lake?
- Okamanpeedan Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tuttle Lake Wetland Complex. Public access is listed as yes.
Can I fish at Okamanpeedan Lake?
- Okamanpeedan Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Iowa's fish and wildlife agency, so check its current regulations before you go.
Explore Okamanpeedan Lake across LakeQuality
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Where this data comes from
15 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA15 samples · 2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory