Washington State Route 121

State Route 121
Route information
Auxiliary route of US 12
Defined by RCW 47.17.225
Maintained by WSDOT
Length:	7.67 mi[1] (12.34 km)
Existed:	1964 – present
Major junctions
North end:	I‑5 near Maytown
South end:	I‑5 near Tumwater
Location
Counties:	Thurston
Highway system
State Highways in Washington Interstate US State Scenic Former PSH 1964 renumbering Former ← SR 119 SR 122 →

State Route 121 (SR 121) is a 7.67-mile (12.34 km) long state highway located entirely in Thurston County, Washington, United States. The highway forms a loop off of Interstate 5 (I-5) near Maytown.

Route description

SR 121 begins at a folded diamond interchange, exit 95 off of I-5, and travels east along Maytown Road. Crossing Beaver Creek twice, the highway travels through lightly populated land, passing the small community of Maytown, before crossing the creek a third time, turning north onto Tilly Road. Immediately upon turning north, the highway crosses over a single track, which the highway paralleled from I-5 to Tilly Road, before passing east of Deep Lake. The highway crosses through Millersylvania State Park before turning west along 93rd Avenue to its northern terminus at exit 99 on I-5.^[2]

History

Between 1937 and the 1964 state highway renumbering,^[3] SR 121 was known as Secondary State Highway 1M, linking Rochester to Maytown.^[4]

WA 801 (1964–1967)

Between the renumbering and 1967, the highway was numbered Sign Route 801, a branch of SR 8, which was decommissioned when U.S. Route 12 was extended into Washington, and the highways designation was changed to the current SR 121.

Major intersections

The entire route is in Thurston County.

Location	mi[1]	km	Destinations	Notes
	0.00	0.00	I‑5
	7.56	12.17	I‑5
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

Route map: Bing / Google

1. "State Highway Log Planning Report 2009 SR 2 to SR 971" (PDF). Washington State Department of Transportation (WSDOT). p. 1027–8. Retrieved December 13, 2010.
2. Google (December 13, 2010). "SR 121" (Map). Google Maps. Google. Retrieved December 13, 2010.
3. Washington State Highways (DjVu) (Map). Washington State Highway Commission. 1937. Retrieved December 13, 2010.
4. "Sign Route Numbers with Corresponding Legislative Highway Numbers" (PDF). Washington State Department of Highways. December 1, 1965. p. 14. Retrieved December 13, 2010.

External links

• Highways of Washington State