查了下Mt. Diablo from Walnut Creek (north)

The first 2.7 miles of this climb are a great warm up at 2.2% average grade.  4.1 miles is at 0-5%, 6.7 miles at 5-10% and 0.9 miles is at 10-15%,  最后几百米最陡。然后有个人竟然rate说这个trail overall 难度是 6 out of 10。。。不知道是夸他自己还是夸这条路...

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