California State Route 175

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State Route 175
Length:	37.89 mi[1] (60.98 km)
Major junctions:
US-101	MEN 0.00
SR-29	LAK 8.24
	LAK 8.25
SR-29	LAK 28.04
Major cities:	Hopland Lakeport Kelseyville Middletown
California State Routes < SR 174 SR 176 > Unconstructed - Deleted - Freeway - Scenic

State Route 175 is a state highway in California, USA. It connects U.S. Highway 101 at Hopland to State Route 29 near Lakeport through the Mayacmas 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 in length are banned from the Hopland Grade, due to its many tight hairpin turns and curves.