California State Route 175

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State Route 175

SR 175 highlighted in red
Route information
Maintained by Caltrans
Length37.89 mi[1] (60.98 km)
RestrictionsNo vehicles longer than 39 feet (12 m) in length between Hopland and Lakeport[2]
Major junctions
West end US 101 at Hopland
Major intersections SR 29 from near Lakeport to near Kelseyville
East end SR 29 at Middletown
Location
CountryUnited States
StateCalifornia
CountiesMendocino, Lake
Highway system
SR 174 SR 177

State Route 175 (SR 175) is a state highway in the U.S. state of California that runs through the Mayacamas Mountains, connecting U.S. Route 101 in Hopland in Mendocino County with State Route 29 in Middletown in Lake County.

Route description

File:State Route 175 Bridge - January 2024 - Sarah Stierch 01.jpg
SR 175 bridge over the Russian River

SR 175 connects U.S. Route 101 at Hopland to State Route 29 near Lakeport through the Mayacamas Mountains. From there it joins SR 29 until Kelseyville, where it loops out until meeting SR 29 again at its end at Middletown. The section between Hopland and Lakeport is also known locally as the "Hopland Grade", or "Hopland Pass."

The portion on SR 29 is part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4]

History

File:California State Route 175 - January 2024 - Sarah Stierch 03.jpg
Restriction signs on SR 175

Originally constructed in the early 1920s, it is one of the steepest and most difficult to drive of any California state highway. Until recently it was called the "crookedest road in California". Vehicles more than 39 feet (12 m) in length are banned from the Hopland Grade, due to its many tight hairpin turns and curves.[2]

Major intersections

CountyLocationmi
[1][5]
kmDestinationsNotes
MendocinoHopland0.000.00 US 101 – Ukiah, Santa RosaWest end of SR 175
Lake17.9228.84
SR 29 north / South Main Street – Lakeport
West end of SR 29 overlap
27.0243.48
SR 29 south – Lower Lake
East end of SR 29 overlap
Middletown37.5160.37 SR 29 (Calistoga Road) / Main Street – Lower Lake, CalistogaEast end of SR 175
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

  1. ^ a b California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
  2. ^ a b California Department of Transportation. "Special Route Restrictions". California Department of Transportation. Archived from the original on July 12, 2024. Retrieved August 21, 2024.
  3. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 17, 2017.
  4. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
  5. ^ California Department of Transportation (2016). Postmile Services (Map). California Department of Transportation. Retrieved September 12, 2016.

External links