Interstate 5 South - Olympia to Grand Mound

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U.S 101 begins at a directional T interchange (Exit 104) with Interstate 5 at the city of Tumwater in one mile.
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Encircling the Olympic Peninsula from Shelton north to Port Angeles and south to Aberdeen, U.S. 101 travels 365.48 miles in Washington. The highway follows the Pacific Coast south to Astoria, Oregon.
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U.S. 101 heads west from Exit 104 to West Olympia and Mud Lake, separating with SR 8 in 5.7 miles. SR 8 joins Olympia with Aberdeen via U.S. 12, a route that was originally signed as U.S. 410.
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An arch bridge carries Capitol Boulevard (Historic U.S. 99) over Interstate 5, east of Capitol Lake.
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The freeway along U.S. 101 and Interstate 5 at Tumwater and south Olympia opened in 1958 as part of a realignment of U.S. 99.
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Interstate 5 crosses Capitol Lake at the separation with U.S. 101 north.
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Exit 103 leaves from within the exchange with U.S. 101 and connects to parallel 2nd Avenue SW south ahead of Custer Way. Tumwater Historical Park spreads along the east side of I-5 nearby next to Capitol Lake.
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Exit 102 for Trosper Road to Black Lake, follows a mile south of the Custer Way overpass. Trosper Road briefly connected U.S. 99 from the 1950s expressway south of Exit 102 with adjacent Capitol Boulevard. Capitol Boulevard was U.S. 99 until 1958.
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Retail lines Trosper Road within the immediate vicinity of the parclo A2 interchange at Exit 102. West of the freeway, Trosper Road (54th Avenue SW) leads to Black Lake-Belmore Road and Black Lake, a popular water-skiing spot. Immediately east of I-5, Trosper Road meets Capitol Boulevard at a roundabout.
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Tumwater Boulevard meets Interstate 5 south at a diamond interchange (Exit 101) in one mile.
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The speed limit along Interstate 5 south increases to 70 m.p.h. at mile marker 102.
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Exit 101 departs Interstate 5 south for Tumwater Boulevard east to Olympia Airport (OLM) and Capitol Boulevard (Old U.S. 99) and west to Littlerock Road.
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SR 121 begins at a diamond interchange (Exit 99) with Interstate 5 in one mile.
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Comprising a 7.67 mile long loop, SR 121 follows 93rd Avenue east from Exit 99 in south Tumwater to Tilley Road south ahead of South Union.
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SR 121 encircles Scott Lake between Exits 99 and 95. 93rd Avenue east from the state route leads to Old Highway 99 north of Tenino.
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SR 121 returns to Interstate 5 near Maytown paralleling the Tacoma Eastern Railroad. The two routes converge at a folded diamond interchange (Exit 95) due to the adjacent railroad line.
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SR 121 travels east along Maytown Road to Tilley Road. Tilley Road takes SR 121 north through Millersylvania State Park.
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West from I-5, Maytown Road continues to Littlerock. A combination of Albany Street, Littlerock Road and Maytown Road between U.S. 12 at Rochester and I-5 was a part of an extended SR 121 until 1991 (AARoads Wiki, 2023).
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The entrance ramp from SR 121 forms an auxiliary lane along Interstate 5 southbound to the Maytown Rest Area.
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The companion rest area along the northbound roadway is by Scatter Creek two miles further south.
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The next facility along Interstate 5 south beyond the Maytown Rest Area is 40 miles away.
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Interstate 5 lowers onto Grand Mound Prairie ahead of a diamond interchange (Exit 88) with U.S. 12 west and Old Highway 99 north.
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U.S. 12 replaced SR 8 between U.S. 99 and U.S. 410 at Elma in 1967 when it was extended west from Idaho.
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U.S. 12 curves northwest through Rochester and Oakville before overtaking former U.S. 410 west to Montesano and U.S. 101 at Aberdeen.
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Old Highway 99 angles 7.6 miles northeast from I-5/U.S. 12 at Exit 88 to South Sound Speedway and SR 507 in the city of Tenino. Two loop ramps previously connected westbound U.S. 12 with I-5 here.
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U.S. 12 east overlaps with I-5 south for 19.95 miles from Grand Mound to Centralia and Chehalis. Old U.S. 99 shifts to the west side of the freeway southward to Harrison Avenue in Centralia.
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Distance sign at the 216th Avenue SW overpass on I-5/U.S. 12 south. Centralia is four miles away while I-5 reaches Portland in less than 100 miles.
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I-5/U.S. 12 south enter Lewis County on the prairie below Davis Hill and other hills to the east.
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