12 miles
987 ft
-5,110 ft
2 miles
High Point

In about 10 miles this ride descends 4700' on various types of singletrack, from buff to primitive and steep. There is some crossing country and climbing to connect Powderhouse Gulch Trail w/ Perreau Creek via either Horn Hunter or Horse Mountain Trails. Always great views to be had along the XC portion. This ride takes from 2 - 4 hours depending on your group.

There are two shuttle options. Leaving a rig at Shoup Bridge Rec. Site is convenient and there is river access and shade, this adds a mile of pavement to the descent. Or park at the junction of Perreau Creek Road and Williams Creek Road.

The dropoff is on the Ridge Road about 3/4 mile south of Williams Creek Summit.

Local Trail Association
Salmon Idaho Mountain Bike Association (www.ridesalmon.com)
Please consider joining or donating to the local riding association to support trail development & maintenance.
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Route POI

RestroomsShoup Bridge Rec. SiteRestrooms
Shuttle Pick-up/Drop-offPerreau Creek RoadShuttle Pick-up/Drop-off


  • Riding area
  • AKA
    powderhouse lower williams
  • Difficulty rating
    Black Diamond
  • Route Type
  • Bike type
  • Direction
    One Direction
  • Physical rating
  • Ridelogs
More Stats for Powderhouse to Perreau mountain bike route
  • Altitude change
    -4,122 ft
  • Altitude min
    4,032 ft
  • Altitude start
    8,156 ft
  • Altitude end
    4,033 ft
  • Grade max
  • Grade min
  • Distance climb
    2 miles
  • Distance down
    9 miles
  • Distance flat
    1,400 ft
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Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Trail Ridden Direction

Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.

  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Ridden Direction

The intendid direction a trail should be ridden.

  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction

Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed or Major Issue / Red

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Water Fountain/Source Water Fountain/Source
  • Sight Sight
  • Restrooms Restrooms
  • Gate Gate
  • Camping Camping
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Other Other
      Trail transparency
      317 | 1 faves
      Ibis Demo Day on Powderhouse
      Ibis Demo Day on Powderhouse
      156 | comments: 0 | favs:
      Oct 18, 2017
      Ibis Demo Day in Salmon
      Ibis Demo Day in Salmon
      425 | comments: 0 | favs:
      Oct 3, 2014

      Recent Trail Reports Along Route

      Lower Williams/Perreau (DH)
      Jun 16, 2017 @ 10:07pm
      Jun 16, 2017
      6/5/17 and 6/6/17 A YEP trail crew removed hazard stumps from the tread, from the top of the saddle, down. From the BLM/FS boundary, they brushed out over growth, created drip drains and Grade Reversals, plus reconstructed 80 feet of a trail bench. After the trail crews efforts, the cows were released for grazing. The top is post holed, but riding well. The lower is in better shape and rolling fast.
      Lower Williams/Perreau
      Jun 16, 2017 @ 9:55pm
      Jun 16, 2017
      SCA crews rerouted the connector trail from the picnic area to Williams creek crossing. They created rock and wood stair cases that are rideable on decents, and possibly be able to climb if you have skills. No matter what, it's fun. They also widened and brushed out the trail on the other side of the creek. A mtb volunteer removed the abandoned barb wire fence and connected the upper and lower sections. The trail is riding great, with exceptions of cattle damage to the tread.
      Powderhouse Gulch
      May 28, 2017 @ 11:07am
      May 28, 2017
      Several chainsaw trees down from pond down to road reporter
      Powderhouse Gulch (Lower)
      May 28, 2017 @ 11:04am
      May 28, 2017
      One large tree laying in trail above last switchback reporter
      Ridge Road (020)
      Jan 27, 2016 @ 9:15am
      Jan 27, 2016
      The Ridge Road is groomed for snowmobiles. Don't expect virgin corduroy, but it is usually firm enough to ride. Ridge Road south from Wms Summit sometimes is rough from the FAA maintenance cat that visits Lake Mtn.
      more reports »
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