Upper Snake Field Office

Henry's Fork — Snake River

Named after Andrew Henry, the first white explorer to experience the area, the Henry's Fork slowly meanders through a high-desert alluvial floodplain lined with cottonwood stands. 

Originating at the outlet of Henry’s Lake, the river offers world-renowned fly fishing and is home to many trumpeter swans.  The headwaters also provides habitat for moose, muskrat, geese and blue heron, as well as spawning grounds for rainbow trout.    

Location:  Follow Highway 20 from St. Anthony, Idaho, access to Red Road Bridge is gained from Highway 20 to Parker, Idaho.  Menan Butte is accessed from Menan-Lorenzo Highway. Turn north to meet the river at Menan Butte, westerly side.

River Access:

  • Red Road Bridge, Salem/Parker Highway (BLM): boat ramp, vault toilet, parking
  • Hibbard Bridge Access (BLM): no boat ramp and limited parking along road shoulder
  • Warm Slough (IDFG): boat ramp, vault toilet, parking, camping
  • Trestle Bridge (BLM): unimproved day-use site, no developed boat ramp
  • Beaver Dick Park (Madison County): boat ramp, vault toilet, camping, picnic area, parking
  • Menan Butte (BLM): boat ramp, vault toilet, parking

Put In: Red Road Bridge, Beaver Dick Park, Menan Butte
Take Out: Beaver Dick Park, Menan Butte 
Total trip length from St. Anthony: about 30 miles, with multiple shorter-mileage options

Plan your trip:

  • State of Idaho invasive species sticker required (see details at right)
  • Use season- usually spring through fall
  • Difficulty - Class I
  • Licensed outfitters
  • Firepans and portable toilets required

Henry's Fork headwaters, with moose and the Teton Range


Henry's Fork- Snake River


Henry's Fork- Snake River from the top of Menan Butte