The best ride option is to shuttle from FR6910 to Merritt Lake Tr1588, although this 10mi (3700' ascent) ride does include a 1.4mi, 1300' (17%) Round Mountain Tr1529 ascent from FR6910 to Nason Ridge Tr1583 which many riders would have to hike-a-bike.
The 4.5mi FR6910 ascends a climbable 1850', so the Nason Creek Rest Area could be used for a 22mi CCW loop, returning 6mi downhill on SR2 from Merritt Lake Tr1588.
The Merritt Lake Tr1588 TH would also be a good option for a 15mi (5900' ascent) shuttle ride from the Nason Creek campground.
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