U.S. Route 93 in Idaho

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U.S. Route 93 marker

U.S. Route 93
Route information
Maintained by ITD
Length: 350.819 mi[1] (564.588 km)
Major junctions
South end: US 93 at the Nevada state line near Jackpot
  US 30 in Twin Falls
I-84 near Twin Falls
US 26 from Shoshone to Arco
US 20 from Carey to Arco
North end: US 93 at the Montana state line at Lost Trail Pass
Counties: Twin Falls, Jerome, Lincoln, Butte, Custer, Lemhi
Highway system

U.S. Route 93 (US 93) is a north–south U.S. Highway in the U.S. state of Idaho.

Route description[edit]

US 93 enters southern Idaho from Nevada, immediately north of the border casino town of Jackpot. Heading northbound in Twin Falls County, it passes through Rogerson and Hollister towards Twin Falls. West of the city, US 93 turns and runs east–west for a few miles, parallel with US 30. This section is Pole Line Road; the highway returns to its north–south orientation in Twin Falls at the intersection of Pole Line Road and Blue Lakes Boulevard.

North of Twin Falls, US 93 crosses the Snake River Canyon via the Perrine Bridge, 486 feet (148 m) above the water. Approximately 3 miles (5 km) north of the bridge, the highway intersects with Interstate 84 at exit 173.

Further north in Shoshone, US 93 connects with the southern terminus of State Highway 75, the former route of US 93 to Ketchum and over Galena Summit8,701 to Stanley and Clayton. Present-day US 93 diverts in a northeasterly route to Richfield, Carey, the Craters of the Moon, and Arco. Between Shoshone and Arco the highway runs concurrently with the east–west US 26, and also with US 20 between Carey and Arco.

From Arco, the highway turns northwest and climbs the Big Lost River valley through Mackay. This section provides views of the Lost River Range to the northeast of the highway, including Borah Peak, the highest point in the state at 12,662 feet (3,859 m) above sea level. Mackay Dam and reservoir are on the southwest side of the highway. The highway crosses the Willow Creek Summit at 7,161 feet (2,183 m) (web-cam) and later descends into Grand View Canyon and heads into the city of Challis.

US 93 creates the northern terminus of State Highway 75 just south of Challis and takes over as the northern leg of the Salmon River Scenic Byway.[2] It descends with the Salmon River as it winds north around the edge of the Lost River and Lemhi mountain ranges into the city of Salmon at 4,004 feet (1,220 m).

Continuing north, the US 93 runs along portions of the Lewis and Clark Trail. The highway follows the descending northbound river until North Fork at 3,620 feet (1,100 m), where the Salmon River makes a left turn to flow west across the state to Riggins. US 93 continues north, climbing the North Fork of the Salmon River into the Bitterroot Range, passing through the Salmon-Challis National Forest and Gibbonsville. The highway exits Idaho at Lost Trail Pass (web-cam) at 7,014 feet (2,138 m) and enters Montana toward the Bitterroot Valley. West of the highway at the pass is the Lost Trail Powder Mountain ski area, with terrain in both states.


US 93 was established in 1926, initially using the modern-day route of SH-75 between Shoshone and Challis. The highway was re-aligned to its modern route via Arco in 1977, replacing an alternative route.[3]

In 2010, the 5.5-mile (8.9 km) Pole Line Road bypass around Twin Falls opened to traffic.[4] US 93 was re-routed to the new bypass, while the old route was signed as US 93 Business.


Major intersections[edit]

County Location mi[1] km Destinations Notes
Twin Falls 0.000 0.000 US 93 south – Jackpot, Las Vegas Nevada state line
38.050 61.236 SH 74 east – Twin Falls
41.498 66.785
US 30 / US 93 Business – Filer, Twin Falls, Sun Valley
Twin Falls 49.455 79.590
US 93 Business south (Blue Lakes Blvd. N)
Jerome 53.056 85.385 I-84 – Sun Valley, Boise, Pocatello
58.708 94.481 SH 25 – Jerome, Eden
Lincoln Shoshone 73.195 117.796 SH 24 east – Dietrich Western terminus of SH–24
73.619 118.478 US 26 west (S Rail Street W) – Gooding Western end of US 26 concurrency
73.659 118.543 SH 75 north (Greenwood Street) – Sun Valley Southern terminus of SH–75
Blaine Carey 112.972 181.811 US 20 west – Picabo Western end of US 20 concurrency
Butte Arco 156.259 251.474 US 20 east / US 26 east – Idaho Falls Eastern end of US 20 concurrency; eastern end of US 26 concurrency
Custer 244.325 393.203 SH 75 south – Stanley, Sun Valley Northern terminus of SH–75
Lemhi Salmon 304.675 490.327 SH 28 south – Leadore Northern terminus of SH–28
350.819 564.588 US 93 north – Missoula Montana state line
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b "Milepoint Log: U.S. Route 93" (PDF). Idaho Transportation Department. January 12, 2016. Retrieved February 14, 2017. 
  2. ^ Idaho Scenic Byways - Salmon River
  3. ^ Special Committee on U.S. Route Numbering (November 12, 1976). "Route Numbering Committee Agenda" (PDF) (Report). Birmingham, AL: American Association of State Highway and Transportation Officials. p. 2. Retrieved February 14, 2017 – via Wikimedia Commons. 
  4. ^ Coltrain, Nick (December 17, 2010). "Bypass opens possibilities on Pole Line; Washington Street brakes for winter". The Times-News. Twin Falls, Idaho. Retrieved February 14, 2017. 

External links[edit]

U.S. Route 93
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