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Kms Miles
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Idaho United States #20 Highway Guide

Miles Kms Item Summary
0.0
0.0
2169 ft.
Bridge/Oregon State Line
Terminus of Idaho highway guide at Oregon State Line. Bridge over Snake River. Community of Nyssa, Oregon "Gateway to the Oregon Trail" (Nyssa Agricultural Museum. Snake River Crossing. Old Fort Boise. Lytle Boulevard Ruts).
1.6
2.5
2274 ft.
Junction of Idaho highway US 95.
North to Fruitland, Idaho.

8.0
12.8
2231 ft.
Parma, Idaho
Community of Parma, Idaho. Old Fort Boise Park.
9.8
15.8
2257 ft.
Junction of Idaho highway US95.
South to Wilder, Idaho.
16.1
25.9
2316 ft.
Notus, Idaho
Community of Notus, Idaho. Limited services.
22.1
35.6
2385 ft.
Junction of Idaho Interstate 84 and US 30.


22.7
36.6
2352 ft.
Bridge
Bridge over the Boise River, ID.
23.7
38.1
2372 ft.
Exit 28 - Caldwell, Idaho
Community of Caldwell, Idaho. College of Idaho (The Orna J. Smith Museum of Natural History).
24.7
39.8
2434 ft.
Junction of Idaho Interstate 84 and US30.
South to Nampa, Idaho.
40.0
64.4
2618 ft.
Junction of Idaho highway 55. - Meridian
Community of Meridian, Idaho. Attractions: (Roaring Springs water park near I-84 exit). Wahooz Family Fun Zone (Amusement. 1385 Blue Marlin Lane, 208-898-0900). North a two miles to Eagle, Idaho.
43.9
70.7
2628 ft.
Junction of Idaho route 44.
Glenwood Street. Northwest to Eagle, Idaho.
45.9
73.9
2654 ft.
Veterans Memorial State Park
Northeast on Veterans Parkway and just across the brige is the Veterans Memorial State Park. Parking. Trails. Walking around Boise Cascade Lake and by the Boise River. Several memorials. Playground for children.
47.1
75.8
2677 ft.
Junction of Idaho Interstate 184.


48.7
78.3
2690 ft.
Boise, Idaho
City of Boise, Idaho. Basque Block - Ethnic Basque related businesses. Idaho International Film Festival. Boise Art Museum (670 Julia Davis Drive - 208-345-8330). The Basque Museum and Cultural Center (611 Grove Street. 208-343-2671). Idaho Black History Museum (508 Julia Davis Drive. 208-433-0017). Boise WaterShed. Discovery Center of Idaho (131 Myrtle Street - 208-343-9895). Idaho Shakespeare Festival (Various dates throughout the Summer). Morrison-Knudsen Nature Center. Boise River Greenbelt. Boise River - fishing, swimming and rafting. Julia Davis Park (Zoo Boise). World Center for Birds of Prey (5668 West Flying Hawk Lane. 208-362-8687). Idaho Anne Frank Human Rights Memorial (800 S. 8th Street by Boise Public Library. 208-345-0304). Idaho Botanical Garden (2355 N. Penitentiary Road. 877-527-3233). Idaho Historical Museum (610 N. Julia Davis Drive. 208-334-2120). Idaho Military History Museum (4748 W. Lindbergh Street, Building 924. 208-272-4841). MK Nature Center (600 S. Walnut Street. 208-368-6060). Museum of Mining and Geology (2455 Old Penitentiary Road. 208-368-9876). Old Idaho Penitentiary State Historic Site (2445 Old Penitentiary Road. 208-334-2844). Roaring Springs Water Park (400 W. Overland Road. 208-884-8842). World Sports Humanitarian Hall of Fame (1910 University Drive. 208-343-7224).
49.0
78.9
2697 ft.
Julia Davis Park
Julia Davis Park by the Boise River.
49.6
79.8
2694 ft.
Bridge
Bridge over the Boise River.
49.8
80.2
2703 ft.
Boise State University
Boise State University. Bronco Stadium.
52.3
84.1
2854 ft.
Junction of Idaho Interstate 84 and US 30
Access to Boise Airport.

54.8
88.2
3005 ft.
Exit 57 - Junction of Idaho highway 21.
East five miles to Lucky Peak Recreation area and Lucky Peak Lake. Lucky Peak Dam. Barclay Picnic Area. Developed and enclosed Beach and swim area with picnicking and other amenities.
57.4
92.3
3133 ft.
Exit 59
Access to Idaho rural roads.
68.0
109.4
3343 ft.
Indian Creek Reservoir
Indian Creek Reservoir. Small lake.
68.6
110.4
3363 ft.
Exit 71
Access to Idaho rural roads.
93.1
149.8
3219 ft.
Exit 95 - Junction of Idaho highway I84, US26, US 30, and state 51. Mountain Home
Community Mountain Home, Idaho. Attractions: Elmore County Historical Museum (180 S 3rd East, Mountain Home. 208-587-6847). Bruneau Dunes State Park & Observatory (27608 Sand Dunes Road, Mountain Home. 208-366-2844). Desert Mountain Visitors Center (2900 American Legion Blvd, Mountain Home. 208-366-2844).

100.5
161.7
3845 ft.
Rattlesnake Station Historical Marker
Rattlesnake Station was a stagecoach station between between Salt Lake City, Utah, and Walla Walla, Washington.
113.8
183.1
4964 ft.
Access to Dam
Follow Anderson Dam Road for 5+ miles to the Anderson Ranch Dam.
116.2
187.0
4957 ft.
Little Camas Reservoir
Little Camas Reservoir just North of highway.
119.4
192.1
5003 ft.
Castle Rocks
Access to Castle Rocks (rock formations) on Castle Rock Road.
135.8
218.5
5098 ft.
Hill City, Idaho
Community of Hill City, Idaho. No services.
149.7
240.9
5062 ft.
Fairfield, Idaho
Community of Fairfield, Idaho. Soldier Mountain alpine ski area is a few miles North of this town. South several miles to Mormon Reservoir. Limited services.
153.7
247.4
5030 ft.
Junction of Idaho highway.
South to Gooding, Idaho.
168.6
271.4
4829 ft.
Magic Reservoir
South of highway is the north arm of Magic Reservoir which is accessible off of Idaho highway 75.
173.6
279.4
4843 ft.
Bridge
Bridge over the Wood River, ID.
175.6
282.6
4885 ft.
Junction of Idaho highway 75.
North to Bellevue, Idaho. South to Shoshone, Idaho.
186.7
300.5
4836 ft.
Picabo, Idaho
Community of Picabo, Idaho. Limited services.
187.6
301.9
4826 ft.
Silver Creek
View of Sliver Creek from highway.
191.7
308.5
4987 ft.
Queen's Crown Mountain
South of highway is the Queen's Crown Mountain formation.
193.5
311.4
4780 ft.
Junction of Idaho US 93 and US 26.
South to Shoshone, Idaho.
193.9
312.0
4783 ft.
Carey, Idaho
Community of Carey, Idaho. Limited services. Carey Airport.
203.7
327.8
4964 ft.
Edge of Craters of the Moon Park
Boundary to the Crates of the Moon Park.
207.4
333.7
5164 ft.
Lava Lake
Lake at the bottom of Lava field.
218.6
351.8
5928 ft.
Craters Of The Moon
Craters of the Moon National Monument and Preserve. Very interesting rock formations, lava flows and craters. Walking trails, interpretive tours, hiking, camping, desert flora and fauna.
225.2
362.4
5446 ft.
Edge of Craters of the Moon Park
Boundary for the Craters of the Moon Park. Lots of cool lava flows.
237.8
382.7
5325 ft.
Junction of Idaho highway US 93. - Arco
Community of Arco, Idaho. First community lit by nuclear power from an experimental station nearby. North to Moore, Idaho.

241.4
388.4
5325 ft.
Butte City, Idaho
Community of Butte City, Idaho. No services.
245.3
394.7
5384 ft.
Junction of Idaho route 33.
Heads Northeast along the edge of the Idaho Falls Nuclear Training Center then cuts across the top to Mud Lake, Idaho.
255.8
411.6
4974 ft.
Idaho National Laboratory
Idaho National Laboratory. Authorized personnel only.
261.2
420.3
4934 ft.
Junction of Idaho highway US 26.
South to Atomic City, Idaho.
284.5
457.8
5108 ft.
Hell's Half Acre Lava Field
Hell's Half Acre Lava Field to the South of the highway.
304.4
489.9
4718 ft.
Junction of Idaho Interstate 15. - Idaho Falls,
City of Idaho Falls, Idaho. Attractions: Tautphaus Park Zoo (2725 Carnival Way. 208-612-8552). Aquatic Center. Museum of Idaho (Broadway and Yellowstone Highway US91. 208-522-1400). Idaho Falls Regional Airport. Idaho Falls on the Snake River. South to Blackfoot, Idaho.

305.0
490.8
4715 ft.
Junction of Idaho Interstate 15.
North to Roberts, Idaho.
305.2
491.2
4698 ft.
Bridge
Bridge over the Snake River, ID.
305.5
491.6
4728 ft.
Freeman Park
North on Fremont Avenue to Freeman Park which is along the Snake River, ID.
307.2
494.4
4744 ft.
Junction 43
Junction of Idaho highway 43.
307.5
494.9
4744 ft.
Bridge
Bridge over an Idaho canal.
312.5
502.9
4803 ft.
Ucon, Idaho
Community of Ucon, Idaho. Limited services.
318.2
512.1
4852 ft.
Bridge
Bridge over a small Idaho river.
318.7
512.8
4859 ft.
Rigby, Idaho
Community of Rigby, Idaho "Birthplace of Television". Birthplace of Philo Taylor Farnsworth, inventor of the television. Jefferson County Museum.
320.9
516.4
4859 ft.
Bridge
Bridge over a small Idaho river.
323.5
520.6
4852 ft.
Bridge
Bridge over the Snake River.
325.7
524.1
4856 ft.
Thomton, Idaho
Community of Thomton, Idaho. No services.
330.8
532.3
4856 ft.
Rexburg, Idaho
Community of Rexburg, Idaho. Teton Flood Museum (51 North Center,Rexburg, ID (208-359-3063). Legacy Flight Museum (400 Airport Road, Rexburg, ID. 208-359-5905).
331.8
533.9
4846 ft.
Bridge
Bridge over the Teton River.
335.6
540.0
4892 ft.
Sugar City, Idaho
Community of Sugar City, Idaho. Limited services.
336.3
541.2
4898 ft.
Teton, Idaho
East two miles to Teton, Idaho. Limited services.
336.8
542.0
4902 ft.
Bridge
Bridge over a small Idaho river.
343.0
551.9
4970 ft.
St. Anthony, Idaho
By the Snake River is the community of St. Anthony, Idaho. Some services.
350.5
564.0
5092 ft.
Bridge
Bridge over the Fall River, ID.
357.0
574.5
5256 ft.
Junction of Idaho highways 32 and 47 - Ashton, Idaho
Community of Ashton, Idaho. Attractions: World's largest seed potato growing area. Annual Ashton Dog Derby (Winter dogsled races). Annual Harvest Festival.
359.9
579.1
5161 ft.
Bridge
Bridge over the Snake River, ID.
361.3
581.4
5509 ft.
Boundary Targhee National Forest
Boundary of the Targhee National Forest.
364.5
586.5
6316 ft.
Pass
Mountain pass.
373.1
600.4
6125 ft.
Swan Lake
Swan Lake. Small lake to West of the highway.
375.1
603.6
6129 ft.
Silver Lake
One mile Northwest to Silver Lake, ID.
375.6
604.5
6109 ft.
Bridge
Bridge over Henry's Fork River.
376.1
605.3
6132 ft.
Junction of Idaho route 47
Called "Mesa Falls Scenic Byway".
379.9
611.4
6165 ft.
Box Canyon, Idaho
Community of Box Canyon, Idaho.
384.3
618.5
6302 ft.
Island Park Reservoir
West of highway is the East arm of the Island Park Reservoir.
388.8
625.7
6424 ft.
Island Park, Idaho
Community of Island Park, Idaho. Some services.
389.2
626.4
6375 ft.
Bridge
Bridge over the Snake River.
390.9
629.1
6427 ft.
Boundary Targhee National Forest
Northern boundary of the Targhee National Forest.
395.2
636.0
6450 ft.
Bridge
Bridge over Henrys Lake Outlet.
397.5
639.7
6588 ft.
Henry's Lake State Park
West a mile to Henry's Lake State Park and Hentrys Lake. Fishing, boating, camping, picnicking, walking, beach, swimming.
398.8
641.7
6637 ft.
Junction of Idaho highway 87.
Northeast to Raynolds Pass.
402.7
648.1
7080 ft.
Montana State Line
Terminus of highway guide at Montana State Border. Targhee Pass and the continental divide for North America.