Washington State Route 121
Encyclopedia
State Route 121 is a 7.67 miles (12.3 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.
, 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.
, SR 121 was known as Secondary State Highway 1M, linking Rochester to Maytown.
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.
{| class="wikitable"
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!scope=col|Location
!scope=col|Mile
!scope=col|Destinations
!scope=col|Notes
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|0.00–0.07
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|Southern terminus
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|7.56–7.67
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|Northern terminus
State highway
State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...
located entirely in Thurston County, Washington, United States. The highway forms a loop off of Interstate 5
Interstate 5 in Washington
Interstate 5 in Washington is a highway in the U.S. state of Washington that extends from its border with Oregon to its border with Canada...
(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 trackSingle track (rail)
A single track railway is where trains in both directions share the same track. Single track is normally used on lesser used rail lines, often branch lines, where the traffic density is not high enough to justify the cost of building double tracks....
, which the highway paralleled from I-5 to Tilly Road, before passing east of Deep Lake. The highway crosses through Millersylvania State Park
Millersylvania State Park
Millersylvania is an 842 acre park 10 miles south of Olympia, Washington. The park has of trails , old-growth cedar and fir trees, and also features camping and 3,300 feet of freshwater shoreline on Deep Lake.Deep Lake is located in Section 3, Township 16N, Range 2W, Willamette.According to the...
before turning west along 93rd Avenue to its northern terminus at exit 99 on I-5.
History
Between 1937 and the 1964 state highway renumbering1964 state highway renumbering (Washington)
In 1963, a law was passed authorizing a new numbering for sign routes. In 1970 the legislative definitions were changed to use the sign route numbers but renamed state routes...
, SR 121 was known as Secondary State Highway 1M, linking Rochester to Maytown.
U.S. Route 12 in Washington
U.S. Route 12 is a major east-west U.S. Highway, running from Aberdeen, Washington, to Detroit, Michigan. It spans across the state of Washington, and is the only numbered highway to span the entire state from west to east, starting near the Pacific Ocean, and crossing the Idaho state line near...
was extended into Washington, and the highways designation was changed to the current SR 121.
Major intersections
The entire route is located in Thurston County{| class="wikitable"
|-
!scope=col|Location
!scope=col|Mile
!scope=col|Destinations
!scope=col|Notes
|-
|
|0.00–0.07
|
|Southern terminus
|-
|
|7.56–7.67
|
|Northern terminus