DSCF0936_bayfront_mess Published October 24, 2011 at 800 × 600 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! But wait, there’s more. They mowed down the grass & weeds which threw debris all over the bike path. But wait, there’s more. They mowed down the grass & weeds which threw debris all over the bike path.