11 miles
3,172 ft
-2,151 ft
5,169 ft
High Point
Trail Supporters, Builders & Maintainers of Centennial (#89) Trail


  • Riding area
    Rapid City
    Rapid City, South Dakota
  • Difficulty rating
  • Trail type
  • Bike type
    AM, XC, Fat
  • Trail Usage
  • Direction
    Both Directions
  • Climb Difficulty
  • Physical rating
  • Season
    Year Round
  • eBike Allowed
  • Global Ranking

This section of Trail 89 is one of the best sections of trail in the Black Hills. The first pitch known as Alkali Ridge is very popular as an out and back to the top of the ridge from Alkali Creek TH (for years people have mistaken this section as Bulldog which is actually the next section of trail to the southwest). This section of trail winds through the forest crossing several different geological strata. Expect flowing single track trail with reasonable climbs and descents. There are several short punchy climbs in the Bull Dog Creek area. The scenery is excellent.

Access Info

Park at either Alkali Creek Trail Head located east of I-90 at Exit 34 a half mile east on BLM Road or at Elk Creek Trail Head located on Runkle Road east of Vanocker Road.

Local Trail Association
More Stats for Centennial Trail (#89) mountain bike trail
  • Altitude change
    1,021 ft
  • Altitude min
    3,578 ft
  • Altitude start
    3,578 ft
  • Altitude end
    4,599 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    7 miles
  • Distance down
    4 miles
  • Distance flat
    3,110 ft
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Layers winter
Trail Style
  • ?
Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Directions to centennial-trail--89-115066 trailhead (44.375800, -103.470090)
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