Secondary Highway 343
Montana Secondary Highway 343 constitutes a 43.18 mile long loop east from Interstate 15 and S-215 near Oilmont to U.S. 2 south of Galata. Following Oilmont Highway, S-343 extends 22.23 miles east from S-215 to S-217 (Strawberry Road) before turning south near Grassy Butte. Galata Road leads S-343 south 19.35 miles to the unincorporated community of Galata and U.S. 2 east of Willow Creek.
East
S-343 (Oilmont Highway) advances east from Interstate 15 and the east freeway Frontage Road toward the unincorporated community of Oilmont.
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S-343 traverses ranch land east from Oilmont.
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West
S-343 (Oilmont Highway) west of Oilmont.
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A diamond interchange joins Interstate 15 with S-343 (Oilmont Highway) at Exit 379.
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The east Frontage Road for Interstate 15 runs north from S-343 (Oilmont Highway) to S-552 (Nine Mile Road) near Sunburst.
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Interstate 15 trailblazer posted at S-343 and the south end of the I-15 Frontage Road near Oilmont.
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Interstate 15 travels north from Oilmont to Sweet Grass and Alberta Highway 4 to Lethbridge, Canada.
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S-343 west ends at Interstate 15 across from S-215 (Kevin Highway) west 4.88 miles to Front Street in the town of Kevin.
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Photo Credits:
- ABRoads: 08/08/16
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Page Updated Monday February 02, 2026.