Amann Reservoir
Morrow County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for Amann Reservoir. Here is what has been measured.
- Hypereutrophic
- Public access
- Limited data
Amann Reservoir in Morrow County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 241 µg/L.
Amann Reservoir is a highly nutrient-loaded hypereutrophic lake in Morrow County, Ohio. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Morrow County, Amann Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-10-02. Methodology: how these readings are compared.
What Amann Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
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. Check local advisories before you swim.
Whether Amann Reservoir is safe to swim in today is a call for the Ohio Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Amann Reservoir
These are the measurements Ohio EPA publishes for Amann Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 241 µg/L. TSI 83.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 241µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 83 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Amann Reservoir
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
- Amann ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Amann Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Amann Reservoir in Morrow County, Ohio — 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 Amann Reservoir are listed below.
Top-rated places to stay near Amann Reservoir
Prices for Nov 6–8, 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 Ohio’s top lakes →
Follow Amann Reservoir’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Amann Reservoir
Nearby Lakes in Morrow County
Frequently asked questions about Amann Reservoir
Where is Amann Reservoir?
- Amann Reservoir is a lake in Morrow County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Amann Reservoir?
- Amann Reservoir in Morrow County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 241 µg/L.
Is Amann Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Amann Reservoir?
- Amann Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Amann Reservoir. Public access is listed as yes.
Can I fish at Amann Reservoir?
- Amann Reservoir 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 Ohio's fish and wildlife agency, so check its current regulations before you go.
Explore Amann Reservoir across LakeQuality
More lakes in Ohio
Other Lakes in Ohio
Hypereutrophic Lakes in Ohio
Where this data comes from
7 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX7 samples · 2024
Analytical methods
- Total Phosphorus After Block Digestion
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
Named boat-access points from the USGS National Boat Ramps inventory