Pleasanton Reservoir
Linn County, Kansas27 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 2 in the county
- 30 ft max depth
- Public access
- Limited data
Pleasanton Reservoir in Linn County, Kansas has a water quality grade of C (Fair). Water clarity: 4.3 ft visibility. Phosphorus: 22.5 µg/L. Chlorophyll-a (algae): 16 µg/L. Surface area: 26.6 acres.
- Clarity
- 4.3 ft
- Max depth
- ~30 ft est.
- Area
- 27 acres
- Type
- Eutrophic
- Phosphorus
- 22.5 µg/L
- Chlorophyll-a
- 16 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Pleasanton Reservoir’s letter
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Pleasanton Reservoir is a 27-acre productive, nutrient-rich eutrophic lake in Linn County, Kansas with an estimated average depth of about 30 feet. Water quality is graded C based on 2 sampling years through 2018. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 1 other monitored lakes in Linn County, Pleasanton Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2018-06-26. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Pleasanton Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water Quality Grade: C (Fair)
Murky, only visible to about 4.3 ft. Phosphorus 22.5 µg/L. Chlorophyll-a 16 µg/L. TSI 54. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | Not graded |
| Phosphorus | 22.5 µg/L | Good |
| Chlorophyll-a (Algae) | 16 µg/L | Fair |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~30 ft est. |
| Average Depth | ~9 ft est. |
| Surface Area | 27 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Pleasanton Reservoir.
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.
Fishing Pleasanton Reservoir
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.061 m/yr | 3 |
| Phosphorus | ↓ Declining | +2.29 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +2.95 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Pleasanton Reservoir is a man-made reservoir impounded by the Pleasanton Lake (completed 1935), built primarily for water supply on the Muddy Creek; earth-type dam, 29 ft tall and 2,900 ft long.
- Surface area
- 26.6 ac
- Normal storage
- 208.8 ac-ft
- Max storage
- 394.9 ac-ft
- Drainage area
- 0.9 sq mi
- Hazard class
- High
- Owner
- PLEASANTON, CITY OF
Source: USACE National Inventory of Dams, NID ID KS02498 · Operator website
EPA Impairment Status
Pleasanton Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM044201 · Official waterbody report
County Ranking
Ranked #1 of 2 lakes in Linn County
Nearby Lakes in Linn County
Frequently asked questions about Pleasanton Reservoir
Where is Pleasanton Reservoir?
- Pleasanton Reservoir is a lake in Linn County, Kansas. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Pleasanton Reservoir?
- Pleasanton Reservoir in Linn County, Kansas has a water quality grade of C (Fair). Water clarity: 4.3 ft visibility. Phosphorus: 22.5 µg/L. Chlorophyll-a (algae): 16 µg/L. Surface area: 26.6 acres.
Is Pleasanton Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Pleasanton Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Pleasanton Reservoir?
- No published bathymetric survey covers Pleasanton Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 30 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 26.6 acres.
Explore Pleasanton Reservoir across LakeQuality
More Kansas Lake Rankings
Other Grade C Lakes in Kansas
Eutrophic Lakes in Kansas
Where this data comes from
13 measurements from 1 monitoring station, 2015–2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX13 samples · 2015–2018
Analytical methods
- Depth, Secchi disk depth
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)