# U.S. Route 30 in Idaho

U.S. Highway 30 (US 30) runs northwest–southeast across the southern half of lower Idaho for 455.481 miles (733.026 km). US 30 enters the state from Oregon across the Snake River in Fruitland and exits into Wyoming east of Dingle. US 30 runs through the large population centers of Boise, Twin Falls, and Pocatello, as well as a plethora of smaller communities from Fruitland to Montpelier. The Thousand Springs Scenic Byway is a picturesque section of US 30 in southern Idaho between the towns of Bliss and Buhl, dipping down into the Hagerman Valley and a canyon of the Snake River.
The highway has four extensive concurrencies with Interstate Highways: Interstate 84 (I-84) twice, I-86, and I-15. Outside of its Interstate concurrencies, the route is largely two lanes and rural outside of portions through major towns and cities.

## Route description
### Oregon state line to Boise

After crossing the Snake River, US 30 enters Fruitland as Northwest 16th Street before intersecting US 95. The route then turns south along US 95 (Whitley Drive in Fruitland). Just north of the I-84 interchange, US 30 turns east toward New Plymouth. In New Plymouth, US 30 bends south, then southeast, and then south again. Just northeast of the Langley Gulch Power Plant, US 30 begins to travel southeast at a diamond interchange, running concurrently with I-84. Along the way, they serve Sand Hollow with one diamond interchange. Just north of Caldwell, US 20 and US 26 enter the freeway southeastward, joining with the concurrency. Entering Caldwell, they then serve I-84 Business/State Highway 19 (I-84 Bus./SH-19) and 10th Avenue before both US 20 and US 26 leave the freeway together on Franklin Road. In Nampa, I-84 and US 30 then serve SH-55, which then travels eastward concurrently with the two routes. The three routes then serve Northside Boulevard, Franklin Boulevard, and Garrity Boulevard (I-84 Bus.). In Meridian, the freeway concurrency serves SH-69. At the next exit, SH-55 leaves the concurrency. Then, in Boise, the freeway comes across I-184 which serves Downtown Boise. Between exits 52 and 54, the freeway is situated north adjacent to Boise Airport, with exit 53 serving the main terminal. Also, at exit 54, US 20 and US 26 rejoin the freeway.

### Boise to Downtown Pocatello

After leaving Boise, the freeway then serves multiple roads (including SH-21) before reaching Mountain Home. In Mountain Home, the freeway serves I-84 Bus. At the next exit, US 20 leaves the freeway alone. The three remaining routes go on to serve several more roads (such as I-84 Bus. and SH-78). Then, in Bliss, US 30 leaves the freeway and enters the Thousand Springs Scenic Byway. As US 30 approaches I-84, the route turns south and east, serving Hagerman, Buhl, Filer, and Twin Falls. North of Kimberly, the route then leaves the byway. In Burley, the route then intersects SH-27 and SH-81. In Heyburn, the route rejoins I-84 while also intersecting SH-24. They then serve SH-25/SH-77 at the same interchange. Then, US 30 transitions from I-84 to I-86 on a modified interchange. Both I-86 and US 30 serve more roads and places (including Register Rock, I-86 Bus., SH-39, and Pocatello Regional Airport). At exit 58, US 30 leaves the freeway as it approaches Pocatello. At this point, US 30 travels along a road parallel to the railroad. Along the way near downtown, it then begins to run concurrently with I-15 Bus. and US 91. Shortly after that, the concurrently splits into a one-way pair.

#### Thousand Springs Scenic Byway

The Thousand Springs Scenic Byway is a picturesque section of US 30 in southern Idaho between the towns of Bliss and Buhl, dipping down into the Hagerman Valley and a canyon of the Snake River. The byway takes its name from the numerous streams and rivulets springing forth out of the east wall of that canyon, many of them plainly visible from the road, with the panoramic river in the foreground. These springs are outlets from the Snake River Aquifer, which flows through thousands of square miles of porous volcanic rock and is one of the largest groundwater systems in the world. The aquifer is believed to be fed by the Big Lost River which disappears into lava flows near Arco, about 90 miles (140 km) northeast of Hagerman.

### Downtown Pocatello to Wyoming state line

The concurrency returns to a two-way street. It then comes across I-15 at a diamond interchange. At this point, both U.S. Highways continue southeast along I-15 while I-15 Bus. ends there. The three routes (I-15, US 30, and US 91) then serve even more places such as another I-15 Bus. in Inkom. At exit 47, US 30 leaves the freeway to serve McCammon. At this point, US 30 begins to meander across several mountains. Between Alexander and Soda Springs, SH-34 runs concurrently with US 30. US 30 then serves more towns through the rest of the state, especially Montpelier. In Montpelier, US 89 briefly runs concurrently with US 30.

## History

US 30 was established in 1926 during the creation of the United States Numbered Highway System, largely along the transcontinental Lincoln Highway, an existing auto trail. The corridor was also preceded by the Old Oregon Trail Highway between Oregon and Utah. The highway crossed southern Idaho by following Route 2 between the Oregon state line and Burley, where it split into two suffixed routes: US 30N through Pocatello and to Montpelier; and US 30S toward Ogden, Utah.
Construction of I-80N (now I-84), a freeway that would parallel US 30 between Portland, Oregon, and northern Utah, began in the 1960s under the Federal-Aid Highway Act of 1956. Various sections of US 30 were relocated onto the new freeway as sections opened over the following two decades. The two suffixed routes were eliminated in 1972 in favor of US 30 remaining on the northern route while generally following I-80N and I-15W (now I-86). A section through Meridian and Downtown Boise was removed in 1980, replaced by a longer overlap with I-84. Five years later, the section from Caldwell to Nampa was replaced with I-84 Bus.

## Major intersections

| County | Location | mi | km | Exit | Destinations | Notes |
| Payette | Fruitland | 0.000 | 0.000 | | US 30 west – Ontario | Continuation west into Oregon |
| Payette | Fruitland | 0.610 | 0.982 | | US 95 north (North Whitley Drive) / NW 16th Street – Payette, Weiser | Western end of US 95 concurrency |
| Payette | ​ | 21.530 | 34.649 | | US 95 south to I-84 – Parma, Winnemucca | Eastern end of US 95 concurrency; destinations signed eastbound only |
| Payette | ​ | 27.940 | 44.965 | | SH-72 east – Emmett | Western end of SH-72 |
| Payette | ​ | 31.073– 31.175 | 50.007– 50.171 | 9 | I-84 west – Ontario | Western end of I-84 concurrency |
| Payette | ​ | 12.906 | 20.770 | 13 | Black Canyon Junction | |
| Canyon | ​ | 17.335 | 27.898 | 17 | Sand Hollow | |
| Canyon | ​ | 24.839 | 39.974 | 25 | SH-44 – Middleton | |
| Canyon | ​ | 25.994 | 41.833 | 26 | US 20 west / US 26 west – Parma, Notus | Western end of US 20/US 26 concurrency |
| Canyon | Caldwell | 26.723 | 43.006 | 27 | I-84 BL east to SH-19 – Caldwell, Wilder, Homedale | |
| Canyon | Caldwell | 27.620 | 44.450 | 28 | 10th Avenue – Caldwell City Center | |
| Canyon | Caldwell | 28.650 | 46.108 | 29 | US 20 east / US 26 east (Franklin Road) | Eastern end of US 20/US 26 concurrency |
| Canyon | Nampa | 33.539 | 53.976 | 33 | SH-55 south / Midland Boulevard – Nampa, Marsing | Western end of SH-55 concurrency; signed as exits 33A (SH-55) and 33B (Midland Blvd.) westbound |
| Canyon | Nampa | 34.965 | 56.271 | 35 | Northside Boulevard | |
| Canyon | Nampa | 35.985 | 57.912 | 36 | Franklin Boulevard | |
| Canyon | Nampa | 37.945 | 61.067 | 38 | I-84 BL west (Garrity Boulevard) – Nampa, Murphy | |
| Ada | Meridian | 42.000 | 67.592 | 42 | Ten Mile Road | |
| Ada | Meridian | 44.007 | 70.822 | 44 | SH-69 – Meridian, Kuna | |
| Ada | Meridian | 45.998 | 74.027 | 46 | SH-55 north – McCall, Eagle | Eastern end of SH-55 concurrency |
| Ada | Boise | 49.307 | 79.352 | 49 | I-184 east / Franklin Road – City Center | I-184 exit 0 |
| Ada | Boise | 50.140 | 80.693 | 50 | Cole Road / Overland Road | Signed as exits 50A (Overland Rd. west) and 50B (Cole/Overland) eastbound, and 50A (Cole/Overland) and 50B (Overland Rd. east) westbound |
| Ada | Boise | 51.997 | 83.681 | 52 | Orchard Street | |
| Ada | Boise | 53.483 | 86.073 | 53 | Vista Avenue – Boise Airport | |
| Ada | Boise | 54.485 | 87.685 | 54 | US 20 / US 26 west (Broadway Avenue) | Western end of US 20/US 26 concurrency |
| Ada | Boise | 56.932 | 91.623 | 57 | SH-21 (Gowen Road) – Idaho City | |
| Ada | ​ | 59.510 | 95.772 | 59 | S. Eisenman Road / Memory Road | Signed as exits 59A (S. Eisenman Rd.) and 59B (Memory Rd.) eastbound |
| Ada | ​ | 63.517 | 102.221 | 64 | Blacks Creek Road – Kuna | |
| Ada | Regina | 70.772 | 113.896 | 71 | Mayfield, Orchard | |
| Elmore | ​ | 74.333 | 119.627 | 74 | Simco Road | |
| Elmore | ​ | 90.280 | 145.292 | 90 | I-84 BL east to SH-51 / SH-67 – Mountain Home, Bruneau | Eastbound signage |
| Elmore | ​ | 90.280 | 145.292 | 90 | West Mountain Home | Westbound signage |
| Elmore | Mountain Home | 95.193 | 153.198 | 95 | US 20 east (Sun Valley Highway) / I-84 BL west / SH-51 south (American Legion Boulevard) to SH-67 – Mountain Home, Fairfield | Eastern end of US 20 concurrency |
| Elmore | ​ | 99.570 | 160.242 | 99 | Old Oregon Trail Road – Mountain Home | |
| Elmore | ​ | 111.800 | 179.925 | 112 | I-84 BL east to SH-78 – Hammett | |
| Elmore | ​ | 113.856 | 183.233 | 114 | I-84 BL west to SH-78 / Cold Springs Road – Hammett | Westbound exit and eastbound entrance |
| Elmore | ​ | 120.149 | 193.361 | 120 | I-84 BL east – Glenns Ferry | Eastbound exit and westbound entrance |
| Elmore | ​ | 121.094 | 194.882 | 121 | I-84 BL west – King Hill, Glenns Ferry | |
| Elmore | ​ | 125.159 | 201.424 | 125 | Paradise Valley | |
| Elmore | ​ | 128.993 | 207.594 | 129 | King Hill | |
| Gooding | Bliss | 172.595 | 277.765 | 137 | I-84 east / US 26 east / Old U.S. 30 – Twin Falls | Eastern end of I-84/US 26 concurrency;western end of US 95 concurrency western end of I-84 Bus. overlap; western terminus of I-84 Bus. |
| Gooding | Bliss | 172.663 | 277.874 | | To I-84 / US 26 (I-84 Bus. east) / South 750 East – Twin Falls, Gooding | Eastern end of I-84 Bus. concurrency; Twin Falls signed eastbound, Gooding westbound |
| Twin Falls | Buhl | | | | North 1500 East Road (SH-46 north) | Southern end of SH-46 |
| Twin Falls | ​ | 211.645– 212.612 | 340.610– 342.166 | | US 93 – Sun Valley, Jackpot, Wells | Western end of US 93 Bus. concurrency; western end of US 93 Bus.; interchange; Sun Valley and Jackpot signed eastbound, Wells westbound |
| Twin Falls | Twin Falls | 217.199– 217.282 | 349.548– 349.681 | | US 93 Bus. north (Addison Avenue) to I-84 – Jerome, Sun Valley | Eastern end of US 93 Bus. concurrency; to I-84, destinations signed westbound only |
| Twin Falls | Twin Falls | 217.915 | 350.700 | | SH-74 south (Shoshone Street South) / Shoshone Street East – Wells | Northern end of SH-74 |
| Twin Falls | ​ | 223.505 | 359.696 | | SH-50 east to I-84 / North 3500 East – Burley, Pocatello | Western end of SH-50 |
| Cassia | Burley | 257.481 | 414.376 | | I-84 BL west / SH-27 (Overland Avenue) – Oakley, Paul | Western end of I-84 Bus. concurrency |
| Cassia | Burley | 258.628– 258.723 | 416.221– 416.374 | | SH-81 east / Airport Way – Declo | Western end of SH-81 |
| Minidoka | Heyburn | 261.123– 261.754 | 420.237– 421.252 | 211 | I-84 west / SH-24 west – Twin Falls, Rupert | Eastern end of I-84 Bus. concurrency; western end of I-84 concurrency;Rupert signed eastbound only; eastern end of I-84 Bus.; western end of SH-84 |
| Cassia | ​ | 216.395 | 348.254 | 216 | SH-25 / SH-77 – Albion, Rupert, Declo | |
| Minidoka | ​ | 272.947– 0.000 | 439.266– 0.000 | 2221 | I-84 east / I-86 begins – Ogden, Salt Lake | Eastern end of I-84 concurrency; Western end of I-86 concurrency |
| Cassia | ​ | 14.807 | 23.830 | 15 | Raft River Area | |
| Power | ​ | 20.590 | 33.136 | 21 | Coldwater Area | |
| Power | ​ | 28.100 | 45.223 | 28 | Massacre Rocks State Park | |
| Power | ​ | 32.620 | 52.497 | 33 | Neeley Area | |
| Power | American Falls | 36.123 | 58.134 | 36 | SH-37 south / I-86 BL east – Rockland, American Falls | |
| Power | American Falls | 40.110 | 64.551 | 40 | SH-39 north / I-86 BL west – Aberdeen, American Falls | |
| Power | ​ | 44.327 | 71.337 | 44 | Seagull Bay | |
| Power | ​ | 49.152 | 79.102 | 49 | Rainbow Road | |
| Power | ​ | 52.491 | 84.476 | 52 | Arbon Valley | |
| Power | ​ | 55.551 | 89.401 | 56 | Pocatello Regional Airport | |
| Power | ​ | 330.820– 330.930 | 532.403– 532.580 | 58 | I-86 east / Tank Farm Road – Idaho Falls | Eastern end of I-86 concurrency; I-86 exit 58 |
| Bannock | Pocatello | 335.778 | 540.382 | | I-15 BL north / US 91 north (Yellowstone Avenue) to I-15 / East Oak Street – Blackfoot, Idaho Falls | Western end of I-15 Bus./US 91 concurrency; to I-15 signed westbound only |
| Bannock | Pocatello | 339.220 | 545.922 | 67 | I-15 north / South Fifth Avenue – Idaho Falls | Eastern end of I-15 Bus. concurrency; western end of I-15 concurrency; southern end of I-15 Bus.; I-15 exit 67 |
| Bannock | Portneuf | 63.037 | 101.448 | 63 | Portneuf Road – Portneuf Area | |
| Bannock | Inkom | 57.694 | 92.849 | 58 | I-15 BL south – Inkom | Southbound exit, northbound entrance |
| Bannock | Inkom | 56.646 | 91.163 | 57 | I-15 BL north – Inkom | Northbound exit, southbound entrance |
| Bannock | ​ | 359.493 | 578.548 | 47 | I-15 south / US 91 south / East Merrill Road – Arimo, Salt Lake | Eastern end of I-15/US 91 concurrency |
| Caribou | ​ | 386.450 | 621.931 | | SH-34 south / Old US 30 – Grace, Bancroft | Western end of SH-34 concurrency; Bancroft signed westbound only |
| Caribou | Soda Springs | 405.543 | 652.658 | | SH-34 north (South Third Street) / South Third Street – Wayan, Jackson | Eastern end of SH-34 concurrency |
| Bear Lake | Montpelier | 434.712 | 699.601 | | US 89 north (Clay Street) / Clay Street | Western end of US 89 concurrency; destinations signed westbound only |
| Bear Lake | Montpelier | 435.015 | 700.089 | | US 89 south (Washington Street) / Washington Street – Paris, Bear Lake, Logan, Salt Lake | Eastern end of US 89 concurrency; only Paris signed westbound |
| Bear Lake | ​ | 455.481 | 733.026 | | US 30 east | Continuation into Wyoming |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus |||||||