Clark County, Idaho

I-15 north approaching Exit 172 - Ranch Exit.

ID-22 east at I-15. Use I-15 south for Idaho Falls. Use I-15 north for Butte (Montana). Continue east on ID-22 for Dubois.

I-15 south (Exit 167) offramp at ID-22. Turn right for ID-22 west to Craters of the Moon National Monument and Arco. Turn left for Dubois.

I-15 south at Exit 167 - ID-22 West/Dubois.

I-15 south approaching Exit 167. Use Exit 167 for Craters of the Moon National Monument.

I-15 South approaching Exit 167 - ID-22/Dubois/Arco. The actual sign at the exit omits Arco from the destination.

I-15 south approaching Exit 172 - Ranch Exit. The destination Ranch Exit was assigned to this interchange, after years of no have a destination. Before no destination, the exit was marked US Sheep Experiment Station.

I-15 south approaching Exit 172 - Ranch Exit.

Distance marker on ID-22 west to Howe, Arco, and Boise.

ID-22 just west of Dubois.

ID-22 west at I-15 south Exit 167 onramp to Hamer and Idaho Falls. Continue west on ID-22 for Arco.

Begin ID-22 west at I-15 north to Butte. ID-22 continues west towards Arco. Use I-15 south for Idaho Falls.

End ID-22 at I-15 north to Butte.

I-15 south at ID-22. Use ID-22 west for Arco, and Craters of the Moon National Monument.

I-15 south at Exit 167 - ID-22 West/CR-A2/Dubois.

I-15 south approaching Exit 167. Use Exit 167 for Craters of the Moon National Monument.

I-15 South approaching Exit 167 - ID-22/Clark County A2/Dubois/Arco. The actual sign at the exit omits Arco from the destination.

I-15 south at Exit 172. Exit 172 was formerly signed as US Sheep Experiment Station

I-15 south approaching Exit 172. Exit 172 does not have a destination, but it formerly had a destination to the US Sheep Experiment Station.

I-15 North at Exit 172. Exit 172 has no destinations, but formerly listed the US Sheep Experiment Station.

I-15 north approaching Exit 172. Exit 172 does not have a destination listed, but was formerly listed as US Sheep Experiment Station.

I-15 north Exit 167 - ID-22 West/Clark County A2/Dubois.

I-15 north approaching Exit 167 - ID-22 West/Clark County A2/Dubois.

ID-22 East Approaching I-15 Junction

Freeway Entrance for I-15 at Eastern Terminus of ID-22 North

I-15 North Exit 167 - ID-22/CR-A2/Dubois. Dubois is the county seat of Clark County, Idaho the smallest (population wise) county in the state.

Entering Clark County on I-15 north at the Jefferson - Clark County line.

I-15 south approaching Exit 190 - Humphrey. This is the first exit on I-15 south in Idaho.

Speed Limit 80 MPH on I-15 south, just south of the Idaho-Montana border. The speed limit along I-15 is 80 MPH to Idaho Falls.

First distance marker in Idaho along I-15 south. Distance to Spencer, Dubois, and Idaho Falls.

Welcome to Idaho on I-15 south at the Idaho-Montana stateline on Monida Pass.

I-15 south Entering Clark Count and Leaving Montana. Taken on Monida Pass on the Continental Divide between Idaho and Montana.

I-15 south at Exit 190 - Humphrey. This is the first exit inside Idaho on I-15 south.

I-15 south approaching Exit 190 - Humphrey. This is the first exit on I-15 south in Idaho.

Welcome to Idaho on I-15 south at the Idaho-Montana stateline on Monida Pass.

I-15 south Entering Clark Count and Leaving Montana. Taken on Monida Pass on the Continental Divide between Idaho and Montana.

Welcome to Montana on I-15 North at the Idaho-Montana state line on Monida Pass. Monida Pass is the Continental Divide.

I-15 north approaching Montana Exit 0 - Monida. The signage is consistent with Idaho Transportation Department signs. The sign says next exit 16 miles, but the next exit is actually Exit 9, at Snowline. The next services are 16 miles in Lima.

Distance marker on I-15 north to Lima, Dillon, and Butte. All destinations are located within Montana. This is just north of Exit 190.

I-15 north at Exit 190 - Humphrey. This is the last exit in Idaho on I-15 north.

I-15 Freeway Entrance To Butte and Dubois at Last Idaho Interchange (Exit 190), Humphrey.

ID-22 west at ID-28. ID-28 has a brown shield because it is part of the Sacajawea Historic Byway.

ID-22 west at ID-28 north to Salmon and south to Idaho Falls.

ID-22 west approaching ID-28.

ID-22 west approaching ID-28

Entering the Idaho National Laboratory on ID-22 west.

ID-22 west at Clark County A1 south to Monteview.

ID-28 South at ID-22

ID-22 Shield on ID-22 North

ID-22/ID-28 Junction on ID-22 East

ID-22/ID-28 Junction to Dubois/Salmon/Rexburg on ID-22 East

I-15 south approaching Exit 184 - Stoddard Creek Area

I-15 south onramp at Exit 180 to Dubois and Idaho Falls.

I-15 north onramp at Exit 180 to Butte. Use I-15 south for Dubois and Idaho Falls.

Lost Gold Scenic Trails Loop in Spencer on Idamon Road. Use Idamon Road for Kilgore.

Lost Gold Scenic Trails and Fort Henry Historic Byway information and map.

Lost Trails Loop and Fort Henry Historic Byway information in Spencer.

I-15 north onramp at Exit 180 to Butte (Montana).

I-15 South Exit 180 offramp. Turn left for Spencer and Kilgore.

I-15 south at Exit 180 - Spencer

I-15 South Exit 184 - Stoddard Creek Area

I-15 south approaching Exit 184 - Stoddard Creek Area

Entering Targhee National Forest on I-15 south.

I-15 north approaching Exit 190 - Humphrey.

I-15 north Exit 184 - Stoddard Creek Area

I-15 north approaching Exit 184 - Stoddard Creek Area

I-15 north at Exit 180 - Spencer. The Nez Perce Trail leaves I-15 here.

I-15 North Exit 180 - Spencer. Spencer is the last town on I-15 north in Idaho. Spencer lies at the base of Monida Pass. the Nez Perce Trail exits I-15 here as well.

Humphrey Exit on I-15 North, Humphrey. Last Idaho exit.