Shamokin Reservoir
Northumberland County, Pennsylvania183 acresView mapDirections
PA DEP publishes the water-quality measurements for Shamokin Reservoir. Here is what has been measured.
- Impaired · Mercury
- Limited data
Shamokin Reservoir in Northumberland County, Pennsylvania has water-quality measurements published by PA DEP, shown here as reported. Phosphorus: 8.5 µg/L. Surface area: 183 acres.
Shamokin Reservoir is a 183-acre lake in Northumberland County, Pennsylvania.
Source: EPA Water Quality Portal sampling records, PA DEP, last sampled 2024-10-17. Methodology: how these readings are compared.
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. Shamokin Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Shamokin Reservoir is safe to swim in today is a call for the Pennsylvania Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Shamokin Reservoir
These are the measurements PA DEP publishes for Shamokin 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 8.5 µg/L.
| 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 | 8.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. |
Ask about Shamokin Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
183 acres
Shoreline
3.5 mi
No bathymetric survey has been published for Shamokin Reservoir, so its depth is not documented here.
Stays via Stay22
Stays near Shamokin Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Shamokin Reservoir in Northumberland County, Pennsylvania — 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.
Top-rated places to stay near Shamokin Reservoir
Prices for Oct 16–18, 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 Pennsylvania’s top lakes →
Follow Shamokin Reservoir’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Shamokin Reservoir
EPA Impairment Status
Shamokin Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit PA-LRP-02050107002035 · Official waterbody report
Nearby Lakes in Northumberland County
Frequently asked questions about Shamokin Reservoir
Where is Shamokin Reservoir?
- Shamokin Reservoir is a lake in Northumberland County, Pennsylvania. Its water-quality measurements are published by PA DEP and shown on this page as reported.
What is the water quality of Shamokin Reservoir?
- Shamokin Reservoir in Northumberland County, Pennsylvania has water-quality measurements published by PA DEP, shown here as reported. Phosphorus: 8.5 µg/L. Surface area: 183 acres.
Is Shamokin Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Shamokin Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Explore Shamokin Reservoir across LakeQuality
More lakes in Pennsylvania
Other Lakes in Pennsylvania
Where this data comes from
Measurements for Shamokin Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
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