California State Route 18
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Map of southern California with SR 18 highlighted in red
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| Route information | ||||
| Defined by | ||||
| Maintained by Caltrans | ||||
| Length: | 117.21 mi (188.63 km) | |||
| Existed: | 1934 – present | |||
| Major junctions | ||||
| CW end: |
 SR 210 in San Bernardino
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| CCW end: |
 SR 138 near Pearblossom
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State Route 18 (SR 18) in the U.S. state of California runs from State Route 210 in San Bernardino to State Route 138 near Adelanto. It is the primary route into the San Bernardino Mountains and has two discontinunities: one in Big Bear Lake, the other in Victorville.
SR 18 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. However, it has not been designated as a scenic highway by Caltrans.
The constructed portion of Route 18 begins at State Route 210 and quickly enters the San Bernardino Mountains as a four-lane expressway. SR 18 is known as Waterman Avenue in the city of San Bernardino before turning into SR 18. The route climbs north at a gentle grade until it turns east, where it begins to offer panoramic views of San Bernardino. Hence, this portion of Route 18 is known as the Rim of the World Highway. After meeting State Route 138 at Mount Anderson Junction south of Crestline, the expressway reverts to a two-lane mountain road. It meets two other highways, State Route 189 just east of Arrowhead Highlands and State Route 173 in Lake Arrowhead, before running over State Route 330 in Running Springs. SR 18 continues through several valleys and near ski resorts before reaching a summit. At that point, Route 18 again runs along a lengthy mountain ridge, offering more spectacular scenery at an even higher elevation. At its west junction with State Route 38 near the west corner of Big Bear Lake, Route 18 jogs across a dam and travels along the south shore of Big Bear Lake. After going through the City of Big Bear Lake, it overlaps with SR 38 and moves from the south to the north side of Bear Valley east of both Big Bear Lake and the Big Bear City airport before it descends from the mountains to the desert on the northerly side of the mountains, first heading northeast, briefly north, and then northwest.
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