Seneca Lake
Noble County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for Seneca Lake. Here is what has been measured.
- 60 ft max depth
- Public access
- Limited data
Seneca Lake in Noble County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Water clarity: 1.7 ft visibility.
Seneca Lake is a lake in Noble County, Ohio with an estimated average depth of about 60 feet. Limited fish-species data available. Public access is available with 9 public boat landings.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2021-09-14. Methodology: how these readings are compared.
Seneca Lake has 9 public boat landings, so a lakefront rental is not the only way to get a boat on the water. If you are planning to stay, you can search lake houses and cabins around Seneca Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Seneca Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch9 documented ramps
- Camping4 public campgrounds nearby
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Seneca Lake 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 Seneca Lake
These are the measurements Ohio EPA publishes for Seneca 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 1.7 ft of visibility. TSI 70.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| 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. | 70 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Seneca Lake
Answers come straight from the public measurements and survey records on this page.
Current Conditions
USGS snapshot Jul 6, 2026, 4:15 AM from gauge 03141000 (Senecaville Lake Near Senecaville OH). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
Water Temperature
Seneca Lake typically sits around 76°F at the surface in September. Summer average is about 79°F. Usually warmest in Jul (about 82°F) and coldest in May (about 71°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (71°F) to its warmest (82°F).
Typical surface water temperature by month, from 182 field readings (2012–2021) via the EPA Water Quality Portal. See the full Seneca Lake water temperature breakdown →
Lake Details
Max depth
~60 ft est.
Public access
Yes
Listed by Ohio EPA
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Ohio has not published bathymetry for Seneca Lake.
Lake Size & Watershed
Watershed (drainage) area
121 sq mi
HydroLAKES / HydroSHEDS
Surface area
3,403 acres
HydroLAKES / HydroSHEDS
Shoreline
29.5 mi
HydroLAKES / HydroSHEDS
Elevation
823 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
- Guernsey County Sportsmen ClubPublic
- Lakeview Boat ClubPublic
- Noble County Fish and GamePublic
- Seneca Lake Park - Campground RampPublic
- Seneca Lake Park - Seneca Marina Pt. CampgroundPublic
- Seneca Launch RampPublic
Showing 6 of 9 documented landings from the USGS National Boat Ramps inventory.
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Seneca Lake
- Seneca Park Lake Woodlands Campground0.5 km
- Seneca Lake Park Parkside Central Campgroun0.8 km
- Seneca Lake Park Parkside Campground1.2 km
- Seneca Lake Park Marina Point Campground2.9 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Seneca Lake
Compare lakeside cabins, hotels, and vacation rentals near Seneca Lake in Noble 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.
Top-rated places to stay near Seneca Lake
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Planning a trip? Cabins and lodging at Seneca Lake → · more Ohio lake trips
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Fishing Seneca Lake
Regulated Pollution Sources Nearby
6 EPA-permitted facilities operate within about 5 miles of Seneca Lake under Clean Water Act (NPDES) discharge permits. 5 facilities have a reported Clean Water Act violation in the past three years.
- Lashley Addition WwtpCaldwell · 0.8 mi away · NPDES OH0144860Recent violation
- Buffalo Hills Campground StpSenecaville · 1.8 mi away · NPDES OH0135186Recent violation
- Senecaville WwtpSenecaville · 2.8 mi away · NPDES OH0041548Recent violation
- Lake Seneca Resorts AssocSenecaville · 2.9 mi away · NPDES OH0076414Recent violation
- Antrim Mennonite Activity CenterGuernsey · 3.7 mi away · NPDES OH0091375Recent violation
- Seneca Lake Camp AreaSenecaville · 3.7 mi away · NPDES OH0059102
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 Noble County
Frequently asked questions about Seneca Lake
Where is Seneca Lake?
- Seneca Lake is a lake in Noble County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Seneca Lake?
- Seneca Lake in Noble County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Water clarity: 1.7 ft visibility.
Is Seneca Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Seneca Lake?
- Seneca Lake typically sits around 76°F at the surface in September, from 182 EPA Water Quality Portal field readings (2012–2021). That is a typical value for the month, not a live reading.
How deep is Seneca Lake?
- No published bathymetric survey covers Seneca Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 60 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
What is the water level at Seneca Lake?
- The USGS snapshot on this page for Seneca Lake is 833.28 ft of water-surface elevation, recorded Jul 6, 2026, 4:15 AM at gauge 03141000. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Are there boat ramps on Seneca Lake?
- Seneca Lake has 9 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Guernsey County Sportsmen Club, Lakeview Boat Club, Noble County Fish and Game, Seneca Lake Park - Campground Ramp, among others. Public access is listed as yes.
Can I fish at Seneca Lake?
- Seneca Lake has 9 documented boat landings 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.
Are there campgrounds on Seneca Lake?
- Seneca Lake has 4 public campgrounds from USGS The National Map within 5 km, including Seneca Park Lake Woodlands Campground, Seneca Lake Park Parkside Central Campgroun, Seneca Lake Park Parkside Campground, Seneca Lake Park Marina Point Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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Where this data comes from
28 measurements from 3 monitoring stations, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Ohio Lake Management Society (Volunteer)
OLMS28 samples · 2020–2021
Monitoring station identifiers (3)
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
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
Public campgrounds from USGS The National Map Structures, within about 3 miles