KCEHC Trail Guide

King County Executive Horse Council

Green River Natural Area

The Green River Natural Area encompasses three formerly separate parks as well as additional natural areas. However, only the former O'Grady Park access point has horse-suitable trails. The combination of the former park lands into the Natural Area designation allows for the better protection of salmon habitat. Accordingly, please keep horses out of the river to prevent the destruction of river-bottom spawning areas.

From the parking area at the O'Grady access point, follow the maintenance road for a mile down towards the river. Near the end of the road, trails branch to the left and right; the right one is a single out-and-back trail, while the left one has a couple of loops.

Current Status Notes



View Green River/O'Grady in a larger map 

O'Grady Access Point: From 164 (Auburn-Enumclaw Rd SE): go south on 164, turn left on SE 380th St, then right onto 160th Pl SE. This turns into SE 384th St. Go a bit over a mile further, and turn left onto 188th Ave SE and follow to the end.
From 169: going south on 169 toward Enumclaw, turn right on SE 400th St (Krain-Wabash Rd) & go 3 miles. Turn right again on 212th Ave SE, and when this takes a sharp left, it turns into SE 384th St. After 1.5 miles, turn right onto 188th Ave SE and follow to the end.


Length: 4+ miles

Surface: dirt

Share with: hikers, bicycles, dogs


Parking for: ~4 trailers

Jurisdiction & Map Links

King County Natural Resource Lands:


History Notes

  • O'Grady Park was formerly a farm run by (you guessed it) the O'Grady family, who produced fruit, vegetables, and livestock. It was acquired by King County in a land swap agreement for a parcel on Queen Anne Hill.