California State Route 175

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State Route 175

Defined by S&HC § 475, maintained by Caltrans

Length:

37.89 mi^[1] (60.98 km)

West end:

US 101 at Hopland

Major
junctions:

SR 29 near Lakeport

East end:

SR 29 at Middletown

State highways in California (list - pre-1964)
County routes in California (list)
< SR 174		SR 177 >
History - Unconstructed - Deleted - Freeway - Scenic

State Route 175 is a state highway in California, USA. It connects U.S. Route 101 at Hopland to State Route 29 near Lakeport through the Mayacamas Mountains. From there it joins Route 29 until Kelseyville, where it loops out until meeting Route 29 again at its end at Middletown. The section between Hopland and Lakeport is also known locally as the "Hopland Grade", or "Hopland Pass." Originally constructed in the early 1920s, it is one of the steepest and most difficult to drive of any California state highway. Indeed, 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.

[edit] Major intersections

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile ^[2]^[3]^[4]	Destinations	Notes
Mendocino MEN 0.00-9.85	Hopland	0.00	US 101
Lake LAK 0.00-28.04		R8.19 29 R40.14	SR 29 north	West end of SR 29 overlap
		29 31.05 8.25	SR 29 south	East end of SR 29 overlap
	Middletown	28.04	SR 29