California State Route 128

Leaving Boonville, Route 128 climbs out of the Navarro River watershed and crosses the Yorkville Highlands before descending into the Russian River watershed, arriving at Cloverdale in the Alexander Valley, where the highway joins U.S. Route 101 heading south.The section of Route 128 through Navarro River Redwoods State Park is often closed in winter storms due to flooding.Even earlier, the road followed the Navarro Ridge, to the north of the present alignment, instead of staying at the river level.[7] By 1938, the last stretches of old winding roadway near the present location of Navarro were replaced by a straighter alignment, taken over from a disused logging railway line.[9] Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.
A relatively straight section of State Route 128 near Hendy Woods State Park
Highway marker showing cosign of US 101 and California Route 128
CaltransAlbionUS 101CloverdaleGeyservilleSR 29CalistogaRutherfordWintersUnited StatesCaliforniaMendocinoSonomaSolanoState highways in CaliforniaInterstateScenicHistoryPre‑1964UnconstructedDeletedFreewaysSR 127SR 129state highwayU.S. stateSacramento ValleyWine CountryState Route 1Interstate 505Hendy Woods State ParkRoute 1Navarro RiverPacific Oceancoast redwoodNavarro River Redwoods State ParkAnderson ValleyBoonvilleRoute 253Russian RiverAlexander ValleyU.S. Route 101Knights ValleyNapa ValleyRoute 29St. HelenaLake BerryessaRoute 113Interstate 80ComptcheCalifornia Freeway and Expressway SystemNational Highway SystemFederal Highway AdministrationFort Bragga different highwayLake TahoeNevada Route 28postmilesPoint ArenaSR 253US 101 Bus. southRedwood HighwayEurekaUS 101 Bus.Stewarts PointSan FranciscoMiddletownLakeportSanta RosaDowntown CalistogaPope ValleySR 121MadisonDowntown WintersReddingVacavilleConcurrencyUS 101Earth Surface Processes and LandformsCalifornia Department of TransportationCalifornia Numbered Exit Uniform System