AMBLEWAY Wildest hikes

9900 Block & PSE Trail via Sammamish River Trail

13.1 mi · ▲ 894 ft · 4 hr 49 min

9900 Block & PSE Trail via Sammamish River Trail is a 13.1-mile out-and-back near Cottage Lake, WA. It climbs 894 ft, with sections as steep as 21% grade. It scores 0/100 on the Ambleway Wildness scale: paved and peopled.

Elevation

0 mi23 – 541 ft · steepest grade: 21%15.2 mi

Getting there

Trailhead: Tolt Pipeline Trail 47.73646, -122.07959
Nearest town Cottage Lake, WA
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Directions

AMBLEWAYwww.ambleway.com

9900 Block & PSE Trail via Sammamish River Trail

13.1 mi · ▲ 894 ft · 4 hr 49 min

Elevation 22–540 ft

Out & Back

Trailhead: Tolt Pipeline Trail · 47.73646, -122.07959

Weather Aug 4: sunrise 5:50 AM · sunset 8:40 PM

Transit-accessible: Avondale Rd NE & NE 149th St stop 73 m from the trailhead · Parking lot at the trailhead

  1. Start on Tolt Pipeline Trail, heading W.
  2. 2.1 miTurn left, heading W.
  3. 0.9 miSharp left, heading SW.
  4. 250 ftBear left, heading SW.
  5. 150 ftContinue straight onto Sammamish River Trail, heading SW.
  6. 1.6 miBear left, heading S.
  7. 0.4 miBear left, heading S.
  8. 250 ftTurn right, heading SW.
  9. 50 ftTurn left, heading SW.
  10. 0.4 miTurn left, heading S.
  11. 50 ftTurn right, heading S.
  12. 0.5 miTurn right, heading SE.
  13. 50 ftTurn left onto PSE Trail, heading SE.
  14. 0.1 miTurn left, heading SE.
  15. 0.2 miContinue straight onto 9900 Block, heading S.
  16. 50 ftSharp right, heading S.
  17. 50 ftTurn left, heading S.
  18. 50 ftBear left, heading S.
  19. 0.1 miTurn left, heading SE.
  20. 200 ftBear left onto PSE Trail, heading SE.
  21. 0.1 miReach PSE Trail, then turn around and head back the way you came.
  22. 0.1 miBear right onto 9900 Block, heading SE.
  23. 150 ftTurn left, heading SE.
  24. 50 ftTurn right, heading SE.
  25. 0.1 miBear right, heading W.
  26. 50 ftTurn right, heading W.
  27. 50 ftContinue straight onto PSE Trail, heading W.
  28. 0.1 miTurn left, heading SW.
  29. 50 ftTurn right, heading S.
  30. 0.1 miTurn right, heading W.
  31. 100 ftTurn left onto Sammamish River Trail, heading W.
  32. 0.5 miTurn left, heading E.
  33. 50 ftTurn right, heading E.
  34. 0.4 miTurn right, heading E.
  35. 50 ftTurn left, heading N.
  36. 150 ftBear left, heading E.
  37. 2 miBear right, heading N.
  38. 250 ftSharp right onto Tolt Pipeline Trail, heading N.
  39. 0.9 miTurn right, heading N.
  40. 2 miArrive back at the trailhead.

Each distance is the walk from the previous step. Tap a step for a map of its junction.

Trail map, photos and weather for this hike: www.ambleway.com/hikes/9900-block-pse-trail-out-back-12-km

Trail surface

39% dirt18% paved11% gravel7% grass25% unspecified

Weather

Sunrise 5:50 AMSunset 8:40 PM

Sunset

The best sunset spot on this hike is 1.2 mi in (~40 min). Leave by 7:40 PM for the 8:40 PM sunset. Back at your car by 9:25 PM, after dark — bring a headlamp. Car visible from the viewpoint

More sunset hikes nearby

Good to know

  • Transit-accessible: Avondale Rd NE & NE 149th St stop 73 m from the trailhead
  • Parking lot at the trailhead

Other ways to reach this destination

More from Tolt Pipeline Trail Trailhead

Hikes near Cottage Lake, Washington