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Washington State Route 121
 State Route 121 | ||||
|---|---|---|---|---|
 SR 121 highlighted in red | ||||
| Route information | ||||
| Auxiliary route of US 12 | ||||
| Maintained by WSDOT | ||||
| Length | 7.67 mi[1] (12.34 km) | |||
| Existed | 1967[2]–present | |||
| Major junctions | ||||
| South end |  I-5 near Maytown | |||
| North end | I-5 near Tumwater | |||
| Location | ||||
| Country | United States | |||
| State | Washington | |||
| Counties | Thurston | |||
| Highway system | ||||
| ||||
State Route 121 (SR 121) is a state highway located entirely in Thurston County, Washington, United States. The highway serves Millersylvania State Park, forming a 7.67-mile (12.34 km) loop between two interchanges with Interstate 5 (I-5) near Maytown. It is an auxiliary route of U.S. Route 12 (US 12).
The highway follows roads constructed in the early 20th century and maintained by the Thurston County government until their incorporation into the state highway system. The state government created Secondary State Highway 1M (SSH 1M) in 1937, initially connecting Rochester to Tumwater before its north end was truncated to Maytown in 1959. SSH 1M was renumbered in 1964 to the short-lived SR 801, which was then replaced by SR 121 in 1967. The Rochester–Maytown section of SR 121 was replaced by the route through Millersylvania State Park in 1991, severing its connection to US 12.
- ^ Multimodal Planning Division (January 4, 2021). State Highway Log Planning Report 2020, SR 2 to SR 971 (PDF) (Report). Washington State Department of Transportation. pp. 964–965. Retrieved September 29, 2021.
- ^ "RCW 47.17.225: State route No. 121". Revised Code of Washington. Washington State Legislature. 1970 [revised 1991]. Archived from the original on September 29, 2021. Retrieved September 29, 2021.
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