Allen County, Ohio · Water Quality Report Card
Lost Creek Reservoir
Lost Creek Reservoir in Allen County, Ohio has a water quality grade of B (Good). Phosphorus: 26.5 µg/L.
- Mean depth
- ~8 ft est.
- Type
- Eutrophic
Lost Creek Reservoir is a productive, nutrient-rich eutrophic lake in Allen County, Ohio with an estimated average depth of about 8 feet. Water quality is graded B based on 1 sampling years through 2024. Compared to the 6 other monitored lakes in Allen County, Lost Creek Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 26.5 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 26.5 µg/L | Good |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~8 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Ohio has not published bathymetry for Lost Creek Reservoir.
Where to stay near Lost Creek Reservoir
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Fishing Lost Creek Reservoir
Location
County Ranking
Ranked #1 of 7 lakes in Allen County
Nearby Lakes in Allen County
Explore Lost Creek Reservoir across LakeGrade
More Ohio Lake Rankings
Other Grade B Lakes in Ohio
Eutrophic Lakes in Ohio
More records, surveys & data sources
EPA Impairment Status
Lost Creek Reservoir 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 OH041000070305 · Official waterbody report
Lake Size & Watershed
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.
Where this data comes from
5 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_WQX5 samples · 2024
Analytical methods
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-09-18
Monitoring stations: 1