Arizona State Route 90
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State Route 90 (SR 90) is a highway in Cochise County, Arizona that runs from the I-10 junction at Benson to a junction with Arizona State Route 80 between Bisbee and Tombstone. It is a north-south route north of Sierra Vista, and an east-west route east of the city. It passes through the San Pedro Riparian National Conservation Area at milepost 329.
The highway was constructed in the 1940s, and originally covered the route from Sierra Vista to US 80 near Bisbee. In the 1960s, the road was extended north, overtaking Arizona State Route 92's path to Whetstone and continuing north to Benson, providing easier access to Sierra Vista and Fort Huachuca from the north. This segment was widened to four lanes in the 1990s.