Gallager Hill Open Space–Lake Washington, 3 lakes is a 4.1-mile out-and-back in Mercer Slough Nature Park near Factoria, WA. The route passes Mercer Slough and Lake Washington before reaching Gallager Hill Open Space at the turnaround, 2 miles in. It is mostly level, with 200 ft of elevation gain, and mostly paved. It scores 0/100 on the Ambleway Wildness scale: paved and peopled.
Elevation
0 mi16 – 118 ft4.6 mi
Getting there
Trailhead: Factoria Trail 47.57879, -122.17295
Nearest town Factoria, WA
Directions
AMBLEWAYwww.ambleway.com
Gallager Hill Open Space–Lake Washington, 3 lakes
4.1 mi · ▲ 200 ft · 1 hr 28 min
Elevation 16–119 ft
Out & Back · Mercer Slough Nature Park
Trailhead: Factoria Trail · 47.57879, -122.17295
Weather Aug 4: Clear, high 77°F / low 52° · precip 0% · wind 3 mph · sunrise 5:50 AM · sunset 8:42 PM
Transit-accessible: Factoria Blvd SE & SE 38th St stop 312 m from the trailhead · Parking lot at the trailhead
- Start on Factoria Trail, heading NE.
- 450 ftSharp left onto I 90 Trail, heading NW.
- 0.8 miPass Mercer Slough.
- 0.1 miPass Lake Washington.
- 0.8 miBear right onto Frontage Road, heading W.
- 50 ftBear right, heading W.
- 50 ftContinue straight onto I 90 Trail, heading W.
- 0.3 miReach Gallager Hill Open Space, then turn around and head back the way you came.
- 0.3 miBear left onto Frontage Road, heading E.
- 50 ftBear left onto I 90 Trail, heading E.
- 1.7 miSharp right onto Factoria Trail, heading E.
- 50 ftBear left, heading E.
- 50 ftArrive back at the trailhead.
Each distance is the walk from the previous step. Tap a step for a map of its junction.
Trail surface
100% paved
Weather
ClearTemperature 77°F52°
Precip0%Wind3 mphUV7Humidity65%
Hourly temperature
80°50°
Sunrise 5:50 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:42 PM
Tue
85°58°
Wed
90°61°
Thu
94°60°
Fri
88°59°
Sat
85°57°
Sun
84°58°
Sunset
The best sunset spot on this hike is 0.2 mi in (~5 min). Leave by 8:16 PM for the 8:42 PM sunset. Back at your car by 9:02 PM — 15 min before dark.
Good to know
- Transit-accessible: Factoria Blvd SE & SE 38th St stop 312 m from the trailhead
- Parking lot at the trailhead
Other ways to reach this destination
More from Factoria Trail Trailhead
- Lake-to-Lake Viewpoint & Lake-to-Lake Trail 3.4 mi · ▲ 255 ft
- Mercer Slough & Lake-to-Lake Trail 5.7 mi · ▲ 142 ft
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Hikes near Factoria, Washington