Interstate 80 in Utah
Interstate 80 (I-80) is a part of the Interstate Highway System that runs from San Francisco, California, to Teaneck, New Jersey. The portion of the highway in the U.S. state of Utah is 196.35-mile-long (315.99 km), through the northern part of the state. From west to east, I-80 crosses the state line from Nevada in Tooele County and traverses the Bonneville Salt Flats—which are a part of the larger Great Salt Lake Desert. It continues alongside the Wendover Cut-off—the corridor of the former Victory Highway—U.S. Route 40 (US-40) and the Western Pacific Railroad Feather River Route. After passing the Oquirrh Mountains, I-80 enters the Salt Lake Valley and Salt Lake County. A short portion of the freeway is concurrent with I-15 through Downtown Salt Lake City. At the Spaghetti Bowl, I-80 turns east again into the mouth of Parley's Canyon and Summit County, travels through the mountain range and intersects the eastern end of I-84 near Echo Reservoir before turning northeast towards the Wyoming border near Evanston. I-80 was built along the corridor of the Lincoln Highway and the Mormon Trail through the Wasatch Range. The easternmost section also follows the historical routes of the First Transcontinental Railroad and US-30S.
|Dwight D. Eisenhower Highway|
Purple Heart Trail
I-80 highlighted in red
|Maintained by UDOT|
|Length||196.35 mi (315.99 km)|
|History||Completed August 22, 1986|
|West end||I‑80 at Nevada state line|
| SR-201 near Magna|
SR-154 in Salt Lake City
I-215 in Salt Lake City
I-15 in Salt Lake City
SR-201 in Salt Lake City
I-15 in South Salt Lake
US-89 in South Salt Lake
I-215 in Millcreek
US-40 / US-189 near Park City
I-84 in Echo
|East end||I-80 / US 189 at Wyoming state line|
|Counties||Tooele, Salt Lake, Summit|
Construction of the controlled-access highway began in the 1950s, and by the late 1970s most of the freeway across the state of Utah had been completed. The four-and-a-half-mile-long (7.2 km) section of I-80 between Utah State Route 68 (SR-68, Redwood Road) and the Salt Lake City International Airport was the last piece of the nearly 2,900-mile-long (4,700 km) freeway to be completed. It was opened on August 22, 1986, and was about 50 miles (80 km) from the site of another cross-country milestone in Utah, the driving of the Golden Spike of the First Transcontinental Railroad at Promontory Summit. Average daily traffic volumes in 2012 ranged between 6,765 vehicles using the freeway at SR-58 and 121,205 vehicles using the freeway at the Spaghetti Bowl in Downtown Salt Lake City. Throughout the state, the highway is also known as the Purple Heart Trail.
Out of the eleven states which I-80 passes through, the 196.34-mile-long (315.98 km) segment in Utah is the fourth shortest. The longest stretch of I-80 in a single state is the 455.32-mile-long (732.77 km) segment in Nebraska. As part of the Interstate Highway System, the entire route is listed on the National Highway System, a system of roads that are important to the nation's economy, defense, and mobility.
Every year, the Utah Department of Transportation (UDOT) conducts a series of surveys on its highways to measure traffic volumes. This measure is expressed in terms of average annual daily traffic (AADT), a measure of traffic volume for any average day of the year. In 2012, UDOT calculated that as few as 6,765 vehicles traveled I-80 at the interchange with SR-58 in Wendover, and as many as 121,205 vehicles used the highway at the Spaghetti Bowl in downtown Salt Lake City. Between seven and 58 percent of the traffic recorded consisted of trucks. These counts are for the portion of the freeway in Utah.
The freeway enters Utah from Nevada in the city of Wendover on the edge of the Bonneville Salt Flats. The cities of West Wendover, Nevada and Wendover are accessible by I-80's only business loop in Utah, whose interchange is just south of Danger Cave. The highway closely follows the historical routes of the Wendover Cutoff, the Victory Highway, and of the ex-Western Pacific Railroad's Feather River Route (now part of the Union Pacific Railroad Central Corridor) across the salt flats and the larger Great Salt Lake Desert. Bonneville Speedway, home to many land speed records, is accessible from I-80. In the middle of the salt flats is a concrete sculpture, Metaphor: The Tree of Utah, which stands just off the westbound carriageway of I-80, 30 mi (48 km) east of Wendover.
Bounded on each sides by military training grounds, the I-80 corridor is overflown by commercial airliners traveling west from Salt Lake City International Airport. The freeway veers north around the Cedar Mountains in a small gap between them and the Lakeside Mountains. Further east, the highway passes the Stansbury Mountains, which are located in the Wasatch-Cache National Forest. After the mountain ranges, the freeway arrives at the southern shore of the Great Salt Lake and closely follows the shore towards the western suburbs of Salt Lake City. However, the historical routes from which the route of I-80 was derived were routed further from the lake, passing through the towns of Grantsville and Tooele; these communities are now served by SR-138 and SR-36 respectively. After an interchange with SR-36 at Stansbury Park, the highway crosses a bottleneck between the Oquirrh Mountains and the Great Salt Lake.
Salt Lake CountyEdit
While traversing the neck, views can be had from I-80 of the Lake and Antelope Island. After passing the neck, the road forks, with I-80 proceeding towards the north end of Salt Lake City and SR-201 proceeding towards the south end. Historically, this intersection was the separation of US-40 and US-50. After the intersection, the freeway corridor is again bottlenecked with the Great Salt Lake to the north and the Kennecott Copper smelter and tailings pond to the south. The Kennecott's Bingham Canyon Mine, which was once considered to be the largest open-pit copper mine, can be seen in the distance. The 1,215-foot-tall (370 m) Kennecott Smokestack is one of the tallest freestanding structures in the United States. Along this portion, the freeway passes the historical site of the Saltair Resort.
The freeway enters the Salt Lake Valley on the former alignment of North Temple Street until it passes the Salt Lake City International Airport, where the freeway veers slightly south and leaves the North Temple Street corridor which leads to Temple Square in downtown Salt Lake City. The Green Line of the Utah Transit Authority (UTA) TRAX system briefly parallels I-80 before traveling down the center of North Temple Street. I-80 becomes concurrent with I-15 after interchanges with SR-58 and 600 South and continues south for about three miles (4.8 km), passing along the western and southern edges of downtown Salt Lake City. The southern interchange with I-15, which also includes SR-201 (21st South Freeway) and marks the end of the concurrency, is known as the Spaghetti Bowl,. In the southwestern corner of the Spaghetti Bowl is another portion of the UTA TRAX Green Line as it travels towards West Valley City. After separating from I-15, the freeway continues easterly through South Salt Lake, loosely following an alignment just south of 2100 South and the UTA S Line streetcar through the Sugar House neighborhood and past Sugar House Park—once the home of the Sugar House Prison towards the clockwise terminus of the I-215 270° belt route around Salt Lake. It continues through Parley's Canyon, where the freeway joins the historical route of the Lincoln Highway. Between the mouth of the canyon and the Summit county line, the route re-enters the Wasatch National Forest.
Parley's Canyon carries I-80 up the western slope of the Wasatch Front as a six-lane freeway, cresting the mountains at an elevation of 7,028 feet (2,142 m) at Parley's Summit. Both the canyon and summit were named for Parley P. Pratt, an early settler to the Salt Lake Valley and an early Mormon leader who was asked to survey a new route across the mountains to replace the route through Emigration Canyon. Between 1848 and 1851, Pratt surveyed, completed, and operated the Golden Pass toll road through the canyon that today bears his name. Pratt had unsuccessfully solicited for $800 (equivalent to $19 thousand in 2018) to build the road, and sold it for $1,500 (equivalent to $37 thousand in 2018). On and off ramps for the Wyoming port-of-entry are located just within Utah. In January 2014, UDOT introduced variable speed limits to I-80 in Parley's Canyon, allowing a speed limit between 35 mph (56 km/h) up to the normal 65 mph (105 km/h) depending on weather or traffic conditions.
Beyond Parley's summit lies Park City, a mining town today better known for its many ski resorts. The Historic Union Pacific Rail Trail State Park travels in the median between carriageways of I-80 before paralleling the highway until the southern end of Echo Reservoir. The freeway turns north upon reaching the Rockport Reservoir at Wanship following the tributaries of the Weber River toward Echo Reservoir and dam. Upon reaching Echo Canyon and the junction with the eastern terminus of the western section of I-84, the freeway follows the canyon east until it reaches the Wyoming state line near Evanston. I-80 forms the northeastern border between Rich and Summit Counties.
The portion through Echo Canyon follows the historical routes of the Mormon Trail, US-30S, and the First Transcontinental Railroad. A rest area in the canyon just east of the junction with I-84 features signs pointing out features that were obstacles for both the Mormon pioneers and the railroad construction workers, including Pulpit Rock, which was partially demolished when the I-80 was built through the canyon.
I-80 follows the routes of two major auto trails through the state. In western Utah, I-80 follows the historical route of the Victory Highway from Wendover at the Nevada state line to the junction of US-40 near Park City. Throughout Utah, I-80 is signed as the modern route of the Lincoln Highway—except through Salt Lake City, where the Lincoln Highway is routed along State Route 201 and Parley's Way. The route of the Lincoln Highway across Utah was generally derived from the route of the Pony Express and the Central Overland Route. However, much of the original route of the Lincoln Highway west of Salt Lake City is inaccessible. The original route of the Lincoln Highway proceeded southwest from Tooele towards Ely, Nevada. This area is now used for military bases, such as the Dugway Proving Ground and Tooele Army Depot. The area was closed to the public when these bases were established. I-80 and US-93 are the modern signing of the Lincoln Highway between those two cities. East of Salt Lake City, I-80 closely parallels the original route of the Lincoln Highway.
In 1926, much of the route covered by I-80, including Pratt's former toll road from the Nevada state line into Salt Lake City, was signed as US-40 then as US-30 to the Wyoming state line. It was also part of the Victory Highway west of Salt Lake and the Lincoln Highway east of Salt Lake at this time. Most of the route had been improved but some stretches of graded road remained. In 1937, parts of the route near Wanship were numbered US-530. In 1950, the highway near Echo was designated US-30S and US-189. By 1959, US-50 Alternate was also routed along the western portion of I-80.
The first Utah State Route to have the number 80 is now known as SR-92, which was originally numbered SR-80 until the 1977 renumbering of Utah State highways. Previously, the freeway's legislative designation was SR-2.
Passage of the Federal Aid Highway Act of 1956 formed the Interstate Highway System, and the I-80 number was first designated to a then-unconstructed controlled-access highway across the state by 1957. I-80 was constructed in segments, starting in the late 1950s. By the late 1970s, the Utah portion of I-80—except for a gap on the western edge of Salt Lake City—was largely complete. A four-and-a-half-mile-long (7.2 km) section between Redwood Road and Salt Lake City International Airport holds the distinction of being the final link of the transcontinental freeway to be completed. As an Interstate Highway, design specifications require a controlled-access highway with no at-grade intersections. This section was dedicated on August 22, 1986, and was the last to be completed to Interstate Highway specifications along the almost 2,900-mile-long (4,700 km) route of I-80 between San Francisco, California and Teaneck, New Jersey. The section was completed close to the thirtieth anniversary of the Interstate Highway System, which was noted at the dedication and considered to be a milestone in the history of highway construction in the United States. It was also noted at the dedication that this was only 50 miles (80 km) south of Promontory Summit, where the golden spike of the United States First Transcontinental Railroad was laid.
The original designation of I-84, which begins at an interchange with I-80 in Echo, was I-80N. This designation was changed to I-84 in 1977 by the American Association of State Highway and Transportation Officials despite objections from the Washington State Department of Transportation and the Idaho Transportation Department, and with the support of UDOT and the Oregon Department of Transportation. The legislative designation for this highway was SR-3 until the 1977 renumbering.
Rebuilding of the first portions of I-80 began in October 1990 with a one-point-four-mile-long (2.3 km) stretch near Redwood Road in Salt Lake City. By 1991, UDOT estimated that the reconstruction of all federally funded highways in the state would cost up to $4.3 billion (equivalent to $7.21 billion in 2018). The Spaghetti Bowl interchange was first proposed in 1996 to accommodate traffic for the 2002 Winter Olympics being held in the city. Most of the Spaghetti Bowl was open by November 2000; the remainder opened in early 2001. In 2002, the Utah State Legislature named the highway the Purple Heart trail, in honor of wounded war veterans. Additional reconstruction work—which involved replacing most of the bridges along the route, resurfacing and installation of sound barriers—was done on I-80 between the Spaghetti Bowl and Parley's Canyon in 2007 and 2008.
|Tooele||Wendover||0.000||0.000||I‑80 west – Reno||Continuation into Nevada|
|0.043||0.069||1||Wendover||Westbound exit and eastbound entrance|
|1.484||2.388||2||I-80 Bus. / SR-58 west – Wendover||No westbound entrance; I-80 Bus. not signed eastbound|
|||3.993||6.426||4||Bonneville Speedway||Rest and View Area off exit|
|||41.278||66.431||41||Knolls (Wendover Cut-off)||Eastern terminus of the Wendover Cut-off|
|||53.996||86.898||Grassy Mountain Rest Area|
|||61.837||99.517||62||Military Area, Lakeside|
|Rowley Junction||76.402||122.957||77||SR-196 – Rowley, Dugway|
|||83.358||134.152||84||SR-138 – Grantsville, Tooele|
|||98.619||158.712||99||SR-36 – Stansbury, Tooele|
|Salt Lake||||101.544||163.419||102||SR-201 east (2100 South) – Magna, West Valley City||Eastbound exit and westbound entrance|
|||104.273||167.811||104||SR-202 / Saltair Drive|
|Salt Lake City||111.287||179.099||111||7200 West|
|113.276||182.300||113||SR-172 south (5600 West)|
|114.336||184.006||114||Wright Brothers Drive||Westbound exit and eastbound entrance|
|115.374||185.676||115|| SR-154 (Bangerter Highway)|
Salt Lake City International Airport
|Signed as exits 115A (SR-154) and 115B (airport)|
|116.488||187.469||115C||North Temple – Downtown Salt Lake City, Temple Square||Eastbound exit and westbound entrance; former SR-186|
|117.262||188.715||117||I-215 – Ogden, Provo||I-215 exit 22 northbound, 22A-B southbound|
|117.862||189.681||118||SR-68 (Redwood Road)|
|119.591||192.463||120||I-15 north (Veteran's Memorial Highway) – Ogden||Eastbound exit and westbound entrance; I-15 exit 308|
|121||SR-269 (600 South)||Eastbound exit and westbound entrance|
|—||I-15 north (Veteran's Memorial Highway) – Ogden||West end of I-15 overlap; westbound left exit and eastbound left entrance; I-15 exit 308|
|306||600 South||Westbound exit and eastbound entrance; exit numbers follow I-15|
|305C||1300 South||Eastbound exit and westbound entrance; C/D lanes provide access to 2100 South/SR-201|
|305B||2100 South||Eastbound exit accessible from C/D lanes|
|Salt Lake City–South Salt Lake line||305A||SR-201 west – West Valley||Part of the Spaghetti Bowl interchange; eastbound exit and westbound entrance; accessible from C/D lanes eastbound; westbound entrance includes direct entrance ramp from 900 West and direct entrance ramp to 1300 South/900 South|
|—||I-15 south (Veteran's Memorial Highway) – Las Vegas||East end of I-15 overlap; eastbound left exit and westbound left entrance; I-15 exit 304|
|122||2100 South / 1300 South / 900 South||Westbound exit and eastbound entrance; part of the "Spaghetti Bowl" interchange; exit numbers follow I-80|
|South Salt Lake||122.028||196.385||123A-B||I-15 south (Veteran's Memorial Highway) / SR-201 west – Las Vegas, West Valley||Westbound exit and eastbound entrance; signed as exits 123A (SR-201) and 123B (I-15) westbound; part of the "Spaghetti Bowl" interchange; I-15 exit 304|
|123.231||198.321||124||US-89 (State Street)|
|Sugar House||124.125||199.760||125||SR-71 (700 East)|
|125.072||201.284||126||1300 East – Sugar House||Former SR-181|
|126.785||204.041||127||2300 East – Holladay, Millcreek||Eastbound exit and westbound entrance; former SR-195|
|127.039||204.449||128||I-215 south (Belt Route)||Eastbound exit and westbound entrance|
|Millcreek||127.685||205.489||129||SR-186 west (Foothill Drive) / Parleys Way||Former US-40 Alternate|
|128.619||206.992||130||I-215||Westbound exit and eastbound entrance; I-215 exit 2 northbound|
|||130.399||209.857||131||Rock Quarry Road||No westbound exit; signed only as "Exit 131"|
|||131.869||212.223||132||Mt. Aire Canyon Road|
|||133.665||215.113||134||SR-65 north – East Canyon|
|||142.847||229.890||View Area (eastbound); exit 144|
|Kimball Junction||144.198||232.064||145||SR-224 south – Park City|
|Silver Creek Junction||146.876||236.374||146||US-40 east (US-189 south) – Heber City, Vernal||West end of US-189 overlap; western terminus of US 40|
|Wanship||154.972||249.403||155||SR-32 south – Wanship, Kamas|
|Coalville||162.592||261.666||162||SR-280 – Coalville|
|||167.324||269.282||168||I-84 west – Ogden||Eastern terminus of I-84; exits 120A-B|
|||178.703||287.595||178||Emory||Westbound exit and eastbound entrance|
|||187.767||302.182||187||Fawcett||Formerly signed as "Ranch Exit"|
|||196.350||315.995||—||I-80 east / US 189 north – Cheyenne||Continuation into Wyoming; proposed toll road for the entire route of I-80 in WY|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
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