State Route 16 and 19 in Idaho

State Route 16 in Idaho

Get started star
End Emmett
Length 16 mi
Length 26 km

State Route 16 or SH-16 is a state route in the U.S. state of Idaho. The road forms a north-south route between Star and Emmett northwest of the capital Boise. The road is 26 kilometers long.

  • Topschoolsoflaw: State overview and brief history of Idaho, including its geography and popular cities.

Travel directions

State Route 16 begins at an intersection with US 20 and then crosses the Boise River. The road here is at an altitude of over 750 meters and is briefly a 2×2 divided highway until State Route 44 in Star. The road then rises slightly out of the Boise River valley and then leads through an uninhabited area of ​​rangeland to the Payette River valley. The road ends in the town of Emmett on State Route 52.

  • thembaprograms: Geography information of Idaho, including animals and plants. Also covers brief history and major cities of the state.


The road was built in the 1920s to connect the Boise River and the Payette River. State Route 16 originally continued as far as Horseshoe Bend, but that section from Emmett became part of State Route 52 in 1938 .

The main upgrade was an expansion at Star, which became part of the booming Boise region. The bridge over the Boise River was replaced by a wider 4-lane bridge between 2012 and 2014. This is a 3.3 kilometer stretch of 2×2 divided highway opened on August 15, 2014.

Construction of a new highway stretch from Chinden Boulevard to I-84 was completed between 2022 and 2024. Initially, the road was built on one level with traffic lights, but the intersections will eventually have to be replaced by grade-separated connections. Construction of the new road began in August 2022 and will be completed by mid-2024.

Traffic intensities

Every day 14,000 vehicles drive between US 20 and Star and 10,000 vehicles between Star and Emmett.

State Route 19 in Idaho

Get started homedale
End Caldwell
Length 20 mi
Length 32 km
Oregon SR-201homedale




State Route 19 or SH-19 is a state route in the U.S. state of Idaho. The road forms an east-west route in the southwestern part of the state, from the Oregon border to Caldwell. State Route 19 is 20 miles long.

Travel directions

State Route 19 begins on the border with the state of Oregon, where State Route 201 connects. The road then travels through flat land to the town of Homedale, where a dual numbering begins with US 95 heading north, crossing the Snake River. Just before Wilder, State Route 19 turns off US 95 and heads east to Caldwell, the largest town on the route. The road leads through a flat agricultural area. Closer to Caldwell, the road has 4 lanes. In Caldwell, State Route 19 ends at Interstate 84 ‘s Business Route.


The road originated from agricultural roads in the Snake River valley. The importance is mainly regional within Idaho, there is virtually no importance as far as Oregon because there is no road further west in that state, State Route 201 leads north to destinations that can be reached more quickly via US 95. In the 1990s, the eastern section of the road between Greenleaf and Caldwell was widened to a 5-lane road with a center turn lane.

Traffic intensities

600 vehicles drive daily on the Oregon border, rising to 6,000 vehicles in Homedale. From Wilder to Caldwell, intensities rise from 6,000 to 16,000 vehicles per day.

State Route 19 in Idaho


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