Pioneer era guiding settlers through the
Cumberland Gap on the
Wilderness Road, the predecessor of US 25E The route of US 25E was recorded to be first traversed by
Native Americans, predominately the
Cherokee people, long before the
Appalachian region was settled by
European pioneers. During this period, the route was considered a part of the Cherokee Warriors' Path. The pathway of US 25E was also known as the Buffalo Trail, named for a legend stating the path was formed from herds of
buffalo traveling from
Asheville, North Carolina to the
Powell River near the
Cumberland Gap for the river's salt licks. Most notably, the pathway of the Corbin to Bean Station section of US 25E was utilized as famous pioneer and settler,
Daniel Boone's
Wilderness Road, being used for early interstate travel through the
Cumberland Gap, aiding interstate travel in Appalachia. Among the early settlers using the Wilderness Road was
William Bean, the recorded first European U.S. settler of the state of Tennessee. Bean would establish the outpost of Bean Station, which served as the new southern terminus of the Wilderness Road, in 1776.
Early auto travel and U.S. numbering In 1915, the initial Bean Station Turnpike, along with a southward extension to
Morristown and the old Wilderness Road from Cumberland Gap to Corbin, was designated as part of the
Dixie Highway, one of the first federal
auto trails. These were among the earliest known national highways developed in the U.S. That same year, the Tennessee Department of Highways and Public Works, the predecessor agency to
TDOT, was formed and tasked with establishing a state highway system. On October 1, 1923, the Tennessee section of the route was designated as
SR 32 with the approval of the initial routes of the
Tennessee State Route System. The first portion in Tennessee to be paved was a section between Tazewell and Harrogate, which took place between 1918 and 1922. The section between White Pine and Morristown was paved between October 1935 and April 1936. Paving of the Jefferson County portion was completed in late 1936. By November 1926, concrete pavement on the portion of the route between Corbin and Barbourville in Kentucky was complete. In July 1928, all Dixie Highway signage on the route in Kentucky was removed and replaced with US 25E signage. All of US 25E was paved with asphalt, concrete, or treated
macadam by the beginning of 1928. The route in Kentucky would be entirely paved by December 1934. During the
Prohibition era of 1920–1933, the route from the Cumberland Gap to Tazewell, along with
SR 33 from Tazewell to
Knoxville, was part of the infamous "Thunder Road", which was used by
bootleggers to illegally transport and trade
moonshine across state lines. The story was later fictionally adapted into a
1958 crime-drama film and
song of the same name. By 1936, the Clinch River Valley portion of US 25E was relocated and reconstructed to make way for the valley's inundation as part of the
Norris Dam project by the
Tennessee Valley Authority (TVA). This project included the construction of two concrete deck girder bridges at Big Sycamore Creek in Claiborne County and Indian Creek in Grainger County, respectively. This project, including the new bridges, cost TVA a total of $17,000 (equivalent to $ in ). In 1941, the Bean Station–Holston River section of US 25E was also relocated by TVA for its
Cherokee Dam hydroelectric project near
Jefferson City. TVA constructed a new truss bridge over the Holston River carrying US 25E between the Grainger and Hamblen county line and relocated US 25E east of its original intersection at US 11W in the old town of Bean Station, close to the Grainger and
Hawkins county border. The reconstruction of US 25E would cost TVA $871,600 (equivalent to $ in ) and an additional $602,500 (equivalent to $ in ) for the Holston River bridge between Bean Station and Morristown. US 25E between Middlesboro and the Cumberland Gap was reconstructed to add a
truck climbing lane in 1953. In November 1955,
KYTC announced a $3-billion (equivalent to $ in ) 20-year comprehensive plan for statewide roadway improvements, including a proposal for US 25E to become a four-lane median divided limited-access highway for its entire length in the state. In December 1958, a relocation of US 25E in Kentucky from Barbourville northbound to Garrich ( west of Gray) was awarded to Oman Construction of Nashville for a cost of $2.297 million (equivalent to $ in ). Relocation work on a section south of Barbourville to
Bimble was announced in 1962.
Upgrades to support Appalachian freight movement With the increased use of the corridor, many portions of US 25E gradually became deficient, leading to plans for its widening and relocation. In 1965, the US 25E corridor from the proposed I-75 in North Corbin to the proposed I-81 in Morristown was proposed as
Corridor S of the
ADHS, which was created by the
Appalachian Regional Development Act that year. Kentucky officials asked for the designation in Kentucky to be removed, with Corridor S only designated on US 25E in Tennessee. This extension was completed by 1970. US 25E was also reconstructed to a four-lane with a
partial cloverleaf interchange at I-81 near the
Witt area of Hamblen County south of Morristown in Tennessee. The contract to construct the related section of I-81 between the southern terminus with I-40 and US 25E near Morristown was awarded in June 1964 and completed in December 1966, along with the connecting section of I-40.
Clinch Mountain cut and geological difficulties For the Clinch Mountain section of US 25E, TDOT engineers finalized two design alternatives, a dual-bore tunnel through the mountain which reduced environmental impacts to the landscape, or a deep cut along the mountain slope providing scenic views of the Clinch Mountain ridge. Citing the high cost of the tunnel proposal and local business opposition, TDOT decided on a deep cut. Work on the connecting section from the summit to south of the Clinch River began in early 1977. Both projects ran into extensive geological problems, which delayed their completion, and increased the cost of the first contract from an initial bid amount of $5.1 million to $10 million. (equivalent to $ to $ in ). The project between US 11W at Bean Station and the gap at Clinch Mountain was completed in July 1980. By 1976, the work on this section in Claiborne County and part of Virginia was complete.
Morristown Bypass project Citing congestion and increased heavy truck traffic on Cumberland Street/Buffalo Trail, the existing alignment of US 25E through Morristown's downtown and central business district was highlighted for replacement with a new four-lane partial-controlled access highway known as the Morristown Bypass to remove heavy truck traffic through downtown Morristown as part of the ADHS plan. In the Morristown Bypass, US 25E was realigned east of its original alignment through Morristown's central business district. Four interchanges were constructed, including a
partial cloverleaf interchange at SR 160, two partial cloverleaf interchanges at US 11E (East Morris Boulevard and Andrew Johnson Highway), and an incomplete half-Y interchange at Buffalo Trail, US 25E's then existing alignment. The Morristown Bypass was completed by 1977. By the completion of the Morristown Bypass, a new bridge over the Holston River between Bean Station and Morristown was announced for construction bids, at a preliminary cost of $8.25 million (equivalent to $ in ) for the new four-lane bridge alone. The new bridge would be complete by 1980. By this time, US 25E in Kentucky had been widened to four lanes in several sections; Corbin to west Barbourville and south to Middlesboro. US 25E in its entirety in Kentucky would be widened to a four-lane expressway by late 1993 to early 1994 to prepare for the Cumberland Gap Tunnel's completion. Throughout the 1970s to the 1990s, highway improvement projects conducted by a joint-effort between
TDOT, the
FHWA, and
ARC began to widen US 25E between the town of Cumberland Gap to
I-81 south of the city of Morristown into a
limited-access and partial
controlled-access highway. Construction work on the section, in coordination with the widening of US 11W between US 25E at Bean Station and an existing four-lane section was complete by the end of 1990. Construction work started on a new alignment for US 25E from the realigned US 11W to the southern base of Clinch Mountain by 1995. It was completed in 1998 with a trumpet interchange at the eastern concurrency terminus of US 11W with an incomplete interchange at the western concurrency terminus of US 11W, with two new bridges at Briar Fork Creek for US 11W westbound towards Knoxville. With the signing of
ISTEA in 1991, the US 25E corridor from I-75 at Corbin to I-81 at Morristown was designated as High-Priority Corridor 12, making it as part of the
National Highway System. With ISTEA, any future projects on the corridor of US 25E became eligible to federal funding up to 80 percent, with the states of Tennessee and Kentucky having to provide the remaining 20 percent.
Clinch River Valley and Tazewell Bypass By 1992, funding for the
survey and
design of US 25E between Tazewell and the Springdale community in Claiborne County was allocated by Governor
Ned McWherter's state budget. In 1994, TDOT would announce a multi-stage plan to widen and relocate a section US 25E between Thorn Hill in Grainger County to south of Harrogate in Claiborne County to prepare for the completion of the Cumberland Gap Tunnel. The project would be split into four sections, from north of Indian Creek to the Clinch River in Grainger County, from the Clinch River to south of Tazewell, a bypass around Tazewell until Anders Street, and from Anders Street to an existing four-lane section south of Harrogate. Before the completion of the Cumberland Gap Tunnel, US 25E saw increased congestion following an uptick in truck traffic bypassing I-75 through
Campbell County and
Knoxville. The route is considered an alternate corridor of I-75 attractive to commuters to regional
metropolises such as
Morristown and
Corbin–
North Corbin and truckers alike connecting to I-81 and I-75, bypassing the congested stretch of I-75 in Knoxville and the stretch north of Knoxville through the Cumberland Mountains, which is prone to
rockslides.
Cumberland Gap Tunnel project for US 25E northbound approaching the Tennessee entrance of the Cumberland Gap Tunnel. In the mid-to-late 20th century, US 25E between Middlesboro and Cumberland Gap had seen an uptick in fatal collisions, with the stretch of highway through the
Cumberland Gap nicknamed "Massacre Mountain". In 1973, officials with the
National Park Service (NPS) received initiatives to construct tunnels underneath the Cumberland Gap in order to resolve the accidents and restore the Cumberland Gap to its pioneer-era state of the 1770s, a motion set forth by the establishment of the
Cumberland Gap National Historical Park by Congress in 1940. The plan, consisting of the construction of twin tunnels, of new a four-lane controlled-access US 25E, two interchanges, seven bridges, and the restoration of the Cumberland Gap, was presented with a cost of $265 million (equivalent to $ in ) and was led by joint effort between the NPS and FHWA. Design work for the project started in 1979, and construction on the tunnels and the new four-lane US 25E began in 1985. The Cumberland Gap Tunnel would open in 1996, completely bypassing Cumberland Gap and Virginia.
Post-tunnel improvements of a split
single-point urban interchange in Morristown near WSCC. This reconstruction removed two signalized intersections on US 25E to improve traffic flow. Since the 2000s, congestion from truck and commuter traffic and the issue of
access control has brought several projects in Tennessee and Kentucky on upgrading US 25E up to
Interstate Highway standards. Kentucky transportation officials cited the route as a "travel corridor the Eastern Seaboard (via connection to
Interstate 40 and
Interstate 81 in Tennessee) for through traffic". Construction work on a new split single-point urban interchange at College Park Drive near WSCC for US 25E started in Morristown on September 2, 2011, by general contractor Summers-Taylor, Inc., of
Elizabethton. The project, consisting of lowering the grade of US 25E, constructing two
frontage roads and three bridges, was completed on October 24, 2015, at a cost of $17.28 million (equivalent to $ in ). Between September 2011 and June 2014, US 25E at I-81 exit 8 was modified in a project that replaced the southbound loop onramp with a traditional diamond bridge ramp, widened the radius of the northbound loop exit ramp, replaced the US 25E overpass with a four-lane bridge, and added turn lanes at the intersections with the ramps. This project was necessitated by the hazardous conditions of the previous two-lane configuration, and the adoption of US 25E as part of an alternate route to I-75. In 2017, design work started on an intersection relocation project of SR 131 near Thorn Hill in Grainger County at US 25E, which shifted the eastern and western junctions of SR 131 north and south of each other, respectively. The project was completed in July 2021 by contractor Charles Blalock and Sons, Inc., at a bid price of $3.98 million. In February 2018, KYTC started work on a widening and access management project on US 25E between the US 25/US 25W terminus and the intersection at KY 3041 (Corbin Bypass). With a cost of $8.8 million (equivalent to $ in ), the project consisted of the removal of existing
traffic lights and being replaced with restricted
J-turn intersections, new frontage roads, and the widening of US 25E from four to six lanes, being completed in 2020. As of 2013, has been completed of Corridor S along US 25E, while remains to be constructed, which consists of
rest areas and design and construction of
interchanges to meet Interstate Highway standards along the stretch of US 25E-labeled corridors F and S. ==Major intersections==