State Route 89 (California)

State Route 89
Sierra Highway
Map of northern California with SR 89 highlighted in red
Route information
Defined by
Maintained by Caltrans
Length:	243 mi (391 km)
Restrictions:	Segments through Monitor Pass and Lassen Volcanic National Park closed in winter
Major junctions
South end:	US 395 near Coleville
	SR 4 near Topaz Lake US 50 in South Lake Tahoe I-80 in Truckee SR 49 near Blairsden SR 36 near Lake Almanor SR 299 in Burney SR 70 in Blairsden SR 44 in Lassen Park
North end:	I-5 near Mount Shasta
Location
Counties:	Mono, Alpine, El Dorado, Placer, Nevada, Sierra, Plumas, Tehama, Shasta, Siskiyou
Highway system
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← SR 88 SR 90 →

State Route 89 (SR 89) is a California State Highway that travels in the north–south direction, and is the major thoroughfare for many mountain communities. It starts from U.S. Route 395 near Topaz Lake, winding its way up to the 8,314-foot (2,534 m) Monitor Pass, down to the Carson River, and up again over the 7,740-foot (2,359 m) Luther Pass. From that point on, the route generally loses elevation on its way past Lake Tahoe, through Tahoe and Plumas National Forests until Lake Almanor. For roughly nine miles the route is then a part of State Route 36. The route then ascends to the 5,753-foot (1,754 m) Morgan Summit. After it enters Lassen Volcanic National Park it continues to gain elevation until it reaches its highest point in an unnamed pass in the middle of Lassen Peak and Bumpass Mountain. The road then descends and heads northwest, finally terminating at Interstate 5 at the foot of Mount Shasta at around 3,600 feet (1,100 m).

SR 89 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. However, it is only a scenic highway as designated by Caltrans from the El Dorado-Placer county line to a point 3.2 miles west of the US 395 junction. From the junction with SR 147, through the park and including the gap on SR 44, to its terminus at I-5, SR 89 is part of the Volcanic Legacy Scenic Byway, a National Scenic Byway.