California State Route 89

Start of California 89 at Mt. Shasta

SR 89 begins at an intersection with US 395. The highway goes west through a few switchbacks before crossing into Alpine County and the Humboldt-Toiyabe National Forest.[5] The southernmost section of State Route 89 over Monitor Pass is also closed in winter due to snow accumulation.[6] SR 89 continues by Heenan Lake before intersecting with the eastern end of SR 4 and turning northwest, passing through Markleeville. SR 89 continues northwest to the town of Woodfords, where it turns west, running concurrently with SR 88 for a brief distance before turning into El Dorado County.[5] The section of SR 89 from SR 88 north to US 50 is co-signed as US 50 Alternate for use as a detour for when US 50 closes.

The highway continues north to Meyers, where it runs concurrently with US 50 into the city of South Lake Tahoe. SR 89 continues along the western shore of Lake Tahoe, where it passes through Camp Richardson, Emerald Bay, Meeks Bay, Pomins, and Tahoma. After crossing into Placer County, SR 89 passes through Chambers Lodge, Homewood, Tahoe Pines, Skyland, Timberland, Pineland, and Tahoe Tavern before coming to an intersection with SR 28, where SR 89 continues to the west, away from the lake. The road curves to the north through Tahoe National Forest before crossing into Nevada County and the city of Truckee.[5] This portion of the highway has been designated the "10th Mountain Division Memorial Highway", honoring the US Army division that lost 992 soldiers during the Italian Campaign in World War II.[7]

SR 89 (South) briefly joins SR 49 (North) in Sierra County, an example of a wrong-way concurrency

SR 89 runs concurrently with I-80 eastbound briefly before exiting to the north and continuing through the city of Truckee and passing near Prosser Creek Reservoir outside of the city limits. SR 89 continues through Hobart Mills before crossing into Sierra County and continuing northwest to Randolph and Sierraville, where it shares a wrong-way concurrency with SR 49 through the town of Sattley; they then intersect CR A23 before SR 89 splits off to the northwest. SR 89 continues through Calpine before crossing into Plumas County.[5]

SR 89 continues through Clio and Graeagle before running concurrently with SR 70 through Plumas National Forest, passing through Blairsden, Feather River Inn, Cromberg, Spring Garden, Massack (where SR 70 and 89 have a rest area), East Quincy, and the city of Quincy. SR 70 and SR 89 continue north through Keddie before SR 89 splits off to the north and passes through Indian Falls, Crescent Mills, Greenville, and Canyondam.[5] The section of SR 89 from SR 70 north to Crescent Mills was built over the abandoned railway bed of the Indian Valley Railroad. SR 89 intersects with the south end of SR 147 before paralleling the southern shore of Lake Almanor and running concurrently with SR 36 westbound, crossing into Tehama County and Lassen National Forest.[5]

SR 36 and SR 89 intersect the northern terminus of SR 32 and SR 172 before SR 36 splits off to the west and SR 89 enters Lassen Volcanic National Park.[5] The SR 89 designation does not run through the national park. The continuation of SR 89 that runs through Lassen Volcanic National Park is closed in winter due to very heavy snowfall and snowpack. When it is open, a park fee is charged. At the other park entrance in the northwest corner in Shasta County, one can continue along SR 44 to the northeast.

California Route 44 and 89 Intersection

SR 89 continues north from SR 44 through Hat Creek and Doyles Corner before intersecting SR 299. The highway passes through Four Corners and Cayton before intersecting CR A19 and crossing into Siskiyou County. SR 89 briefly passes through the Klamath National Forest and Bartle and McCloud before coming to an interchange with I-5. SR 89 then merges with Mount Shasta Boulevard and terminates just outside the Mount Shasta City city limits.[5]

One point of interest along California State Route 89 includes the Pony Express remount station in Woodfords, the Lake Tahoe Outlet Gates in Tahoe City (control of these gates was the source of the two-decade "Tahoe Water War" between lakeshore owners and downstream Truckee River water users), Plumas-Eureka State Park (containing Johnsville, a well-preserved '49er town, and Pioneer Ski Area, the first sport skiing area in the Western hemisphere), Lake Almanor and Lassen Volcanic National Park.

Many other points of interest, including Brokeoff Mountain, Sulphur Works, Emerald Lake, Lake Helen, Bumpass Hell, Lassen Peak and Summit Lake are also located on this highway.

SR 89 is part of the California Freeway and Expressway System,[8] and north of the southern SR 44 junction is part of the National Highway System,[9] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[10] SR 89 is eligible for the State Scenic Highway System;[11] 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,[12] meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.[13] 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.[14] The segment of SR 89 from I-80 in Truckee to SR 49 through Sattley also forms part of the Yuba-Donner Scenic Byway, a National Forest Scenic Byway.[15]

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. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[16] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile [16][1][17]	Exit [18]	Destinations	Notes
Mono MNO 0.00-7.60	​	0.00		US 395 – Carson City, Coleville	South end of SR 89
Alpine ALP 0.00-23.97	Bullion	9.96		SR 4 west – Angels Camp, Stockton
	Markleeville	​		CR E1 (Montgomery Street)
	Woodfords	21.37 19.22[N 1]		SR 88 east – Minden	South end of SR 88 overlap
	​	13.40[N 1] 21.38		SR 88 west (US 50 Alt. west) / Burnside Lake Road – Kirkwood, Jackson	North end of SR 88 overlap; south end of US 50 Alt. overlap
El Dorado ED 0.00-27.41	Meyers	8.55 70.62[N 2]		US 50 west – Placerville	South end of US 50 overlap; north end of US 50 Alt. overlap
	​	71.48[N 2]		Pioneer Trail
	South Lake Tahoe	75.45[N 2] 8.56		US 50 east (Lake Tahoe Boulevard) – Stateline	North end of US 50 overlap
Placer PLA 0.00-21.68	Tahoe City	T8.57		SR 28 east (Lake Boulevard) – Kings Beach
	​	13.72		Squaw Valley Road
Nevada NEV 0.00-8.70	Truckee	0.49 14.16[N 3]		I-80 west / Donner Pass Road – Sacramento	Interchange; south end of I-80 overlap; I-80 exit 185
		​	South end of freeway on I-80
		14.97[N 3]	186	Central Truckee	No northbound entrance
		16.29[N 3]	188A	Truckee	Northbound exit and southbound entrance
		​	North end of freeway on I-80
		16.60[N 3] R0.62		I-80 east / SR 267 south – Reno, Lake Tahoe	Interchange; north end of I-80 overlap; I-80 exit 188B
Sierra SIE 0.00-29.58	Sierraville	15.06		SR 49 north – Loyalton	South end of SR 49 overlap
	Sattley	​		CR A23 (Westside Road)
	​	19.96		SR 49 south – Bassetts, Sierra City, Downieville	North end of SR 49 overlap
	​	23.08		To CR A23 / Calpine Road – Beckwourth
Plumas PLU 0.00-R42.19	Valley Ranch	​		CR A15 (Portola-McLears Road) – Portola
	​	7.08		Gold Lake Highway – Gold Lake, Downieville
	Graeagle	​		CR A14 (Graeagle-Johnsville Road)
	Blairsden	8.71 R66.63[N 4]		SR 70 east – Portola	South end of SR 70 overlap
	​	49.80[N 4]	Massack Rest Area
	​	33.03[N 4] 8.72		SR 70 west – Oroville, Marysville	North end of SR 70 overlap
	​	14.84		CR A22 (Arlington Road) – Taylorsville, Antelope Lake
	Canyondam	29.59		SR 147 north – Westwood, Susanville, Lake Almanor East Shore Peninsula
	​	R42.19 6.29[N 5]		SR 36 east – Chester	South end of SR 36 overlap
Tehama TEH R0.10-4.40	​	99.94[N 5]		SR 32 west – Chico
	Morgan Springs	91.25[N 5]		SR 172 west – Mill Creek
	​	87.68[N 5] R0.10		SR 36 west – Red Bluff	North end of SR 36 overlap
	​	4.40	Lassen Volcanic National Park south boundary
Gap in route
Shasta SHA R49.35[N 6]-43.35	​	R49.35[N 6]	Lassen Volcanic National Park north boundary
	​	R49.35[N 6]		SR 44 west – Redding	South end of SR 44 overlap
	​	62.69[N 6] 0.00		SR 44 east (Feather Lake Highway) – Susanville, Reno	North end of SR 44 overlap
	​	21.72		SR 299 – Fall River Mills, Alturas, Burney, Redding
	​	38.78		CR A19 (McArthur Road)
Siskiyou SIS 0.00-R34.62	​	R34.62		I-5 – Portland, Redding	Interchange; north end of SR 89; I-5 exit 736
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

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• AARoads- State Route 89
• Caltrans: Route 89 highway conditions
• California Highways: SR 89