The Round Mountain loop offers fun single track trails that go up and over Round Mountain and down to the South Yuba river. This was filmed a week after the last rain, near perfect conditions.
Purdon Crossing: The elegant truss bridge at Purdon Crossing (1895) has a unique half trough design which makes this the only bridge of its kind in California. It is only one lane with a severe load limit because of deterioration.
There are plenty of other fun mtb rides in the Grass Valley - Nevada City area.
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