Surveyors Ridge Tr688

View of Surveyors Ridge Trail #688

Overall: 10

Aerobic: 6

Technical: 5

Steepness: 4

Flow: 9

Singletrack: 100%

Surveyors Ridge Tr688 is a classic ridgeline trail, with moderate climbing that intensifies over the length of the trail, offering great views of Mt. Hood and the valley below.




Avg: 25mi



Elevation Change

Avg Ascent:2300'

Ascent Incline



Avg: 4hr







Surveyors Ridge Trail

The Surveyors Ridge Tr688 TH is also the trailhead for High Prairie Tr639.

Surveyors Ridge Tr688 gets dusty in late summer, can be limited by treefall in the Spring, and dries out within a few days of rainfall.

FR17 parallels Surveyors Ridge Tr688, with several FS connectors to the trail along the way, which might be useful in case of a breakdown or accident but not recommended as a return loop.

Although most riders choose to start from FR44, using the northern FR17 TH as the starting point enables the entire trail to be ridden, without creating an inverted ride profile.

If starting from the southern FR44 TH, then either turn around at Bald Butte Mountain or shuttle to the northern TH, due to the steep descent from Bald Butte to the northern FR17 TH.

For those seeking a more strenuous ride, Surveyors Ridge Tr688 can be combined with Oak Ridge Tr688A and Dog Rvr Tr675 into an all-day, epic 27mi ride.

Start at the Oak Ridge Tr688A TH. Go on Smullin Rd, on the left 1.4mi past the Mt Hood Country Store and just before the Hwy Dept facility.

The road to the Oak Ridge TH is at the first curve.

For camping, check out Knebal Spgs CG, which is the TH for the Knebal Spgs Tr474 loop.


Dog River Surveyors Epic

This is a 24.5mi (5200' ascent) CCW loop, consisting of Dog Rvr Tr675 to Surveyors Ridge Tr688, ending with a wild bombing run on Oak Ridge Tr688A.

TH: From the Oak Ridge Tr688A TH, go to SR35 then climb 500' on SR35S to the Dog Rvr Tr675 TH.

3.7mi: Climb 6.6mi (2500' ascent) on Dog River Tr675 to FR620, then go 2.6mi further to the Surveyors Ridge Tr688 TH.

10.9mi: Ride Surveyors Ridge Tr688 to the 1850' Oak Ridge Tr688A descent back to the TH.

Directions: NW Forest Pass required right at the TH. Pass the Parkdale ranger station and continue SR35S to FR44. Go up FR44 to the Surveyors Ridge TH at FR620. Loop: Park at the Oak Ridge or Dog River TH. View Larger Map. No Map?.

View of Mount Hood from the Surveyors Ridge trail Surveyors Ridge, Dog River, Zig Zag, Oak Ridge Trails Topo Map

OAB Directions

round the bend and into the woods

Surveyors Ridge Area Topo Map

  • Ride starts with singletrack alongside FR44, to the second creek crossing, a fast, relatively flat section with a few waterbar jumps along the way.
  • 1.6mi: At Cooks Meadow, go left across the small (unbridged) creek, then go for 2.3mi on dual track down to an FR17 connector road, where the singletrack starts for real.
  • 3.8mi: At the end of the doubletrack descent, go left at the trailhead sign, then ride through some fast, winding singletrack.
  • 4.6mi: After a little section of fast, winding singletrack, go around a scree field then cross FR680. After passing several view points, with some short ascents, pass Shellrock Mountain at 6.8mi. View of slope near Shellrock Mountain
  • 8.4mi: After a short but steep ascent, descend to a FR17 intersection, just south of Gibson Prairie Horse Camp. This is followed by another steep ascent, to FR671.
  • 9mi: FR671 is a good turnaround point, as the descent intensifies, as the ridgeline drops off to the FR17 TH.
  • 9.8mi: Descend to Yellowjacket Creek, followed by a short climb to a view point. This is followed by a steep descent to the Oak Ridge Tr688A upper TH
  • 11.3mi: From the Oak Ridge Tr688A upper TH the trail continues to drop off sharply to FR630 and the power lines.
  • 12.2mi: The trail turns to doubletrack just past the power lines, for 2.1mi, passing Bald Butte at 13mi.
  • 14.4mi: Doubletrack ends at the FR intersection, followed by a switchback descent to the FR17 TH.



Best Area Guide


Trail Rankings

Ranking consistently applied to all of the listed trails.

  • Overall Rating: Ride quality and challenge
  • Aerobic: Ascent challenge
  • Technical Difficulty: Terrain challenge
  • Steepness: Average incline
  • Flow: Uninterrupted riding
  • Elevation Change: Total elevation gain
  • Ride Difficulty: Terrain challenge






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