US lakes & pondsUS lakes & pondsSurface area: The USGS National Hydrography Dataset outline (NHD Permanent ID 40839289).
The red circle marks Johnson Reservoir.
Towns and counties: U.S. Census Bureau boundaries overlaid on the USGS lake outline (Idaho: incorporated places touching the lake, otherwise the nearest one).
Official IDFG pages. Rules and fees change; check before you go.
Built only from the data on this page: official access lists, OpenStreetMap beaches and trails, campground listings, state and USGS invasive-species records. We don't rate crowds or water quality.
Stocked by the state: Rainbow trout (2015–2026, 12 years; 27,908 fish in all, fry included)
Source: Idaho Department of Fish and Game, Idaho Fishing Planner stocking records (releases into Johnson Reservoir, Franklin County, since 2015). These are stocking records, not a full fish survey; other species also live here.
No public access sites are listed for this water in the OpenStreetMap boat ramps (no statewide agency ramp layer used) data.
Shoreline: USGS National Hydrography Dataset (NHD Waterbody, Permanent ID 40839289), public domain. State outline: U.S. Census Bureau TIGERweb. Points: OpenStreetMap boat ramps (no statewide agency ramp layer used). Interactive map: Leaflet with © OpenStreetMap contributors. Not for navigation.
We found 10 campgrounds and RV parks within 15 miles of Johnson Reservoir. Distances are straight-line from the nearest point on the shoreline, so driving distance is longer.
RVs welcome · Tent sites · Toilets · Drinking water
RVs welcome · Tent sites · Toilets · Drinking water
Tent sites
All campgrounds & RV parks in Idaho
Green tent icons on the lake map mark campgrounds near the shore, and the interactive map shows the closest 12. Amenities are listed only where a source records them; call or check the campground's website before you go, since seasons and rates change every year.
Campground data: Recreation.gov (RIDB) · OpenStreetMap contributors (ODbL). Pulled Oct 12, 2026.
The closest airport with scheduled passenger flights to Johnson Reservoir, plus larger airports within about 150 miles:
Compare car rentals near this lake
Car rental links go to our partner Discover Cars; LakeRipple may earn a commission at no extra cost to you. Affiliate disclosure.
Airports with scheduled airline service from OurAirports (large and medium airports); larger airports are FAA large, medium and small hubs by FAA CY2025 enplanements ("major airport" = FAA large hub). Distances are straight-line from the lake's center, not driving distance; road routes are longer.
Live from the National Weather Service API for the lake's coordinates (42.1096, -111.8087). The nearest station may be several miles away. NWS forecast for Johnson Reservoir. No live water-temperature sensor is shown because we haven't found a public one for this lake.
Based on solunar theory, an estimate. Major periods (about 2 hours) center on when the moon is directly overhead or underfoot; minor periods (about 1 hour) center on moonrise and moonset. The 0–100 activity score rises during those periods and gets a boost near sunrise and sunset and around the new and full moon. Weather, water temperature and pressure often matter more. Sun and moon times are calculated in your browser from the lake's coordinates with standard astronomy formulas, shown in MT (America/Boise), and accurate to within a few minutes.
Johnson Reservoir covers about 44 acres in Preston, Idaho (Franklin County).
IDFG fish stocking records lists Rainbow trout.
Yes. We list 10 campgrounds and RV parks within 15 miles.
Johnson Reservoir touches Preston in Franklin County, Idaho.
Know Johnson Reservoir? Tell us about the launch, parking, where they're biting or anything a first-time visitor should know. Tips go privately to the LakeRipple editor; nothing is posted automatically. Helpful tips may be featured on this page (we'll use your first name only if you give one).
Straight-line distance between lake centers. All Idaho lakes & ponds · All waters in Preston