State Highway 128 (SH-128) is a
state highway
A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...
in the U.S. state of
Idaho, serving the city of
Lewiston in
Nez Perce County. The highway travels east along the
Clearwater River within Lewiston from
Washington State Route 128 (SR 128) to
U.S. Route 12 (US 12). It was created in 1989 after improvements were made to an existing county road.
Route description
SH-128 begins at the eastern terminus of
SR 128 at the
Washington–
Idaho state line that separates the cities of
Clarkston and
Lewiston. The highway travels east along the
Clearwater River as the Down River Road through an
industrial park located in northern Lewiston. SH-128 intersects its
spur route
A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway. A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the s ...
and turns northeast towards its eastern terminus, an intersection with
US 12 eastbound.
To the north of the highway is
Lewiston Hill
Lewiston Hill (also known as the "Clearwater Escarpment") is a large sloping escarpment in the northwest United States, located immediately north of the confluence of the Clearwater and Snake rivers in north central Idaho.
Residents of the nearb ...
. The Old Spiral Highway has its southern terminus at an intersection with SH-128.
Every year, the
Idaho Transportation Department (ITD) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of
average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, ITD calculated that 4,702 vehicles per day used SH-128 between the Washington state line and US-12.
History
SH-128 was designated by the
Idaho Transportation Board
Idaho ( ) is a state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Montana and Wyom ...
on August 18, 1989, after requests from local port officials to improve an existing county road named Down River Road. The number was chosen to match an
existing highway in Washington, which was extended to the state border in 1990 by the
Washington State Legislature
The Washington State Legislature is the state legislature of the U.S. state of Washington. It is a bicameral body, composed of the lower Washington House of Representatives, composed of 98 Representatives, and the upper Washington State Senat ...
.
Major intersections
Spur route
SH-128 has a short,
spur route
A spur route is a short road forming a branch from a longer, more important road such as a freeway, Interstate Highway, or motorway. A bypass or beltway should not be considered a true spur route as it typically reconnects with another or the s ...
near its eastern terminus at
US 12 in
Lewiston.
The spur route travels southeast from SH-128 to US 12 westbound and serves as an extension of the intersection of the two highways to the north.
References
{{Reflist
128 128 may refer to
*128 (number), a natural number
*AD 128, a year in the 2nd century AD
*128 BC, a year in the 2nd century BC
*128 (New Jersey bus)
See also
* List of highways numbered
A ''list'' is any set of items in a row. List or lists may al ...
Transportation in Nez Perce County, Idaho