U.S. Route 20
Route information
Length:	3,365 mi[2] (5,415 km)
Existed:	November 11, 1926[1] – present
Major junctions
West end:	US 101 in Newport, OR
	I-5 at Albany, OR I-15 at Idaho Falls, ID I-25 at Casper, WY I-35 near Williams, IA I-55 near Chicago, IL I-75 near Toledo, OH I-81 near Syracuse, NY I-87 near Albany, NY I-91 in Springfield, MA I-95 in Waltham, MA
East end:	Route 2 in Boston, MA
Highway system
United States Numbered Highways List • Bannered • Divided • Replaced

U.S. Route 20 (US 20) is an east–west United States highway. As the "0" in its route number implies, US 20 is a coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States,^[2] and the route sparsely parallels Interstate 90 (I-90). However, a gap in signage exists through Yellowstone National Park which splits the route into two sections.

It and US 30 break the general U.S. Route numbering rules in Oregon, since US 30 actually starts north of US 20 and runs parallel to the north throughout the state. The two overlap and continue in the "correct" positioning near Caldwell, Idaho. This is because US 20 was not a planned coast-to-coast route while US 30 was. US 20 originally ended at the eastern entrance of Yellowstone Park; it was extended in 1940.^[2]

The highway's eastern terminus is in Boston, Massachusetts, at Kenmore Square, where it meets Route 2. Its western terminus is in Newport, Oregon, at an intersection with US 101, within a mile of the Pacific Ocean.^[3]

Route description[link]

The highway passes through the following states:

Western section[link]

Oregon[link]

US 20 begins at an intersection with US 101 in Newport, Oregon, and runs generally eastward towards Idaho. On the way it goes over the Central Oregon Coast Range, through several Willamette Valley cities including Corvallis and Albany, climbs the Cascade Mountains over Santiam Pass, goes through Bend, Oregon, and traverses the Oregon High Desert passing through Burns, Oregon. It eventually overlaps with US 26 in Vale, and the two roads continue concurrently to the Idaho border.

Idaho[link]

US 20 crosses into Idaho from Oregon northwest of Parma. It runs concurrently with US 26 and joins US 95 through Parma. US 20/US 26 leaves US 95 southeast of Parma and runs to Caldwell where US 20/US 26 joins with I-84 and US 30 for a short time. These four highways parallel each other (on two roadways) to Boise where US 20/US 26 runs through downtown before joining with I-84 and US 30 again to Mountain Home, where it departs at exit 95 to head east, past Rattlesnake Station, Anderson Ranch Dam road, and cresting at Cat Creek summit at 5,527 feet (1,685 m) above mean sea level. It continues into and across Camas County through Fairfield to Timmerman Junction, the intersection in Blaine County with State Highway 75, the route to Sun Valley, Galena Summit, and Stanley. US 20 continues east through Picabo and Carey, joined with US 26 and US 93, to Craters of the Moon and Arco, where US 93 splits off and turns north-northwest to climb the Big Lost River valley. US 20/US 26 continues on through the Idaho National Laboratory, where the highways split just west of Atomic City; US 26 heads to Blackfoot and US 20 to Idaho Falls, where it turns north-northeast to pass near Rexburg as a freeway. US 20 then climbs through the communities of St. Anthony, Ashton, and Island Park, and crosses the Continental Divide at Targhee Pass at 7,072 feet (2,156 m), entering Montana west of West Yellowstone.

Montana[link]

In the state of Montana, US 20 runs for less than 10 miles (16 km). It runs from the Idaho state line to West Yellowstone, Montana, the western entrance to Yellowstone National Park. US 20 is known as the Targhee Pass Highway in Montana.

Eastern section[link]

Wyoming[link]

In the state of Wyoming, the eastern segment of US 20 starts at the eastern entrance to Yellowstone National Park along with the western termini of US 14 and US 16. These three routes run east to Greybull, where US 14 continues east and US 16/US 20 turns south; at Worland, US 16 turns east while US 20 continues south. US 20 joins US 26 in Shoshoni, where it turns east. In Casper it joins I-25 and US 87. These four routes stay combined to Orin, where US 20 turns east. At its intersection with I-25, US 18 begins. US 18 and US 20 are concurrent from Orin to Lusk. US 18 separates there and US 20 runs east into Nebraska.

Nebraska[link]

In the state of Nebraska, US 20 runs from west of Harrison to South Sioux City on the Missouri River. Portions overlap US 385, US 83, US 183, US 275, I-129, and US 75.

Iowa[link]

US 20 enters Iowa at Sioux City via the Missouri River crossing with I-129 and US 75. After skirting the southeast side of Sioux City as a freeway with US 75, US 20 continues east as an expressway to Moville. From Moville through Sac City to north of Rockwell City, US 20 is a rural two-lane highway. The highway runs concurrently with Iowa 4 for several miles until it splits via an interchange. North of Rockwell City, US 20 becomes a four-lane road for the rest of its length in Iowa. US 20 passes to the south of Fort Dodge and Webster City before intersecting I-35 near Williams.

US 20 crosses the Mississippi River connecting Dubuque, Iowa, and East Dubuque, Illinois

A new segment of freeway between US 65 south of Iowa Falls and Iowa Highway 14 opened in 2003 creating a continuous four-lane route from Moorland to Dubuque. The new segment shaved 16 miles (26 km) off US 20's length in Iowa. In the Waterloo/Cedar Falls area, the segment of US 20 overlapped by Iowa Highway 27 is designated as a part of the Avenue of the Saints. US 20 passes Independence, Manchester, and Dyersville before reaching Dubuque. At Dubuque, US 20 crosses into Illinois over the Julien Dubuque Bridge.

Illinois[link]

In the state of Illinois, US 20 begins in East Dubuque, following southeastward along the Mississippi River, and continues into the very hilly Driftless Area of northwest Illinois through Galena and Elizabeth. The highway then transitions eastward from the Driftless Area to the Interior Plains near Stockton. The road continues as a bypass north of Freeport, and then runs as a freeway along the southern fringe of Rockford. From Rockford to Chicago, US 20 is a mixture of four-lane expressway, four-lane limited access freeway, and winding two-lane surface road. It is signed as "General U.S. Grant Highway" after Ulysses S. Grant.U.S. 20 runs through the south side of Chicago as 95th Street. US 20 exits Illinois along with US 12 and US 41 as Indianapolis Avenue south of the Chicago Skyway.

Looking westbound at US 20 as it meets State Road 127 in a traffic circle in Angola, Indiana

Indiana[link]

In the state of Indiana, US 20 enters from the west beneath the Chicago Skyway with US 12 and US 41. US 20 passes through heavily industrialized northwestern Indiana and is the main east–west artery through Gary. It then parallels US 12 to just west of Michigan City before running due east to South Bend. US 20 travels around South Bend and Elkhart on the St. Joseph Valley Parkway, a four-lane limited access freeway, then returns to surface road east of Elkhart. US 20 then passes through LaGrange and Angola, intersecting with I-69 before leaving Indiana just north of the eastern terminus of the Indiana Toll Road.

From Gary to South Bend, US 20 was built as the Dunes Relief Road. During the 1930s and 1940s the Dunes Highway, US 12, was becoming more crowded as housing lots and communities developed in the Indiana Dunes. Today, there are numerous communities along US 20 and the lakefront, including Gary, Portage, Burns Harbor, Porter, Chesterton, Pines, and Michigan City.

Most notably, the route is one of the main access roads to the Indiana Dunes National Lakeshore.

Ohio[link]

Sign for US 20 along with the sign for State Route 7 in Conneaut, Ohio

US 20 enters Ohio from Indiana just west of Columbia and traverses east through Pioneer and Alvordton to Fayette. It continues east through Oakshade, Assumption and Sylvania to Toledo, and then into the Toledo suburb of Maumee. After Maumee, US 20 continues east through Perrysburg to Woodville, where it becomes a four-lane, non-limited access highway. It bypasses Fremont while concurrent with US 6, State Route 53, and State Route 19, and then travels through the northern edge of Clyde and the downtown area of Bellevue, where it is joined by State Route 18. From there the four-lane highway continues through Monroeville and bypasses Norwalk, then becomes a two-lane highway from there to Oberlin. Continuing east, US 20 traverses through Elyria, North Ridgeville, Westlake, Rocky River, Lakewood and Cleveland, where it goes right through Public Square. East of Cleveland US 20 follows the southern shore of Lake Erie, following Euclid Avenue from Public Square, and traverses Euclid, Wickliffe, where it intersects with I-90, Mentor, Painesville, Geneva, Ashtabula and crosses into Pennsylvania just east of Conneaut.

Pennsylvania[link]

I-79 at US 20 (exit 182) in Erie, Pennsylvania

US 20 runs for nearly 50 miles (80 km) across Erie County, Pennsylvania, most of that time just south of the CSX Amtrak railroad tracks. US 20 appears as West Ridge Road eastward from the Ohio border through Springfield, Girard, Fairview and Millcreek townships. At the intersection with Pennsylvania Route 832, just outside of the Erie city limits, it becomes West 26th Street. After it reaches city center at the intersection with State Street, it becomes East 26th Street. It turns sharply northward as Broad Street at the Bayfront Connector, then turns east again as Buffalo Road through Wesleyville and Harborcreek Township. Buffalo Road turns sharply northward at the town of Harborcreek. US 20 intersects with Pennsylvania Route 955 and resumes its eastward journey. At North East Township, US 20 becomes West Main Road. Within the town limits, it becomes West Main Street until it reaches the town center at its intersection with Pennsylvania Route 89, where it becomes East Main Street. Outside the town limits it becomes East Main Road until it reaches Pennsylvania's border with New York.

New York[link]

US 20 marker outside Skaneateles, New York

In New York, US 20 runs roughly parallel to the New York State Thruway (I-90) throughout the state. The route runs concurrently with New York State Route 5 twice, with the second overlap extending 68 miles (109 km) across Western and Central New York from Avon to Auburn. US 20 runs across the rural Cherry Valley Turnpike between Skaneateles and Albany.

Massachusetts[link]

In Massachusetts, US 20 runs near I-90 Mass Pike, intersecting it at exits 2 and 10A.

In part of Berkshire County, US 20 runs north–south as it shares the roadway with US 7. It is known as "Jacob's Ladder" as it crosses the Berkshire Hills between Lee in Berkshire County and Chester in Hampden County. From Chester to Westfield, US 20 and the Boston and Albany Railroad follow the Westfield River down to the broad valley of the Connecticut River.

In Shrewsbury, US 20 is called "Hartford Turnpike." In Northborough, it is called "Southwest Cutoff", then "Main Street".

In parts of eastern Massachusetts, US 20 follows the route of the old Boston Post Road and passes by Longfellow's Wayside Inn, in Sudbury, the oldest continually operated Inn in America. When Henry Ford purchased the Wayside Inn, he re-routed US 20 to the south so that major traffic would bypass the inn. The original route of US 20 is now called Wayside Inn Road.

History[link]

Before the U.S. Highway System, the route in New England and New York was designated as New England Interstate Route 5 (NE-5), part of the New England Interstate Route system that existed between 1922 and 1927. Around 1923, from Springfield to Pittsfield, NE-5 was known as "Jacob's Ladder",^[4] and from Boston to Albany, the "Hubway". When US 20 was first commissioned, it took over the entirety of NE-5.

Historic termini[link]

Until 1940, the western endpoint of US 20 was the east entrance to Yellowstone National Park.

Historic routes[link]

Between Fort Dodge, Iowa, and Dubuque, Iowa, the route has been upgraded to four lanes, the last link of this completed in 2003. Much of the old route is a few miles north of the present route except between I-35 and Waterloo. There, the old route is farther north, going through Iowa Falls, Aplington, and the north side of Cedar Falls along what is now Iowa Highway 57.

From just west of South Bend, Indiana, to the St. Joseph – Elkhart county line, the old route of US 20 through St. Joseph County is now Business US 20. In Elkhart County, its old route is now classified as a county road and is simply called Old US 20. The St. Joseph Valley Parkway is the present route of US 20 in the South Bend – Elkhart Area.

From 1930 to 1933, US 20 followed what are now Massachusetts Route 67 and Massachusetts Route 9 from Worcester to Palmer via Shrewsbury and Northborough.^[5]

The 1953 Massachusetts Department of Public Works Master Plan would have relocated US 20 between Palmer, Massachusetts and either West Springfield, Massachusetts or Westfield, Massachusetts along the right-of-way now used by the Massachusetts Turnpike, but this was never implemented.^[6]

Until 1970–72,^[5] US 20 followed an old route through downtown Springfield—Boston Road and State Street—crossing the Connecticut River via the older Memorial Bridge (now Massachusetts Route 147). The construction of I-291 prompted a change. US 20 now crosses from West Springfield at the North End Bridge, and is co-signed with I-291 until Page Boulevard, where it heads back to Boston Road via the former route of 20A.

Historic names[link]

• The portion of US 20 eastward from Illinois generally follows the path of the Yellowstone Trail.
• In Massachusetts, US 20 is referred to as the Old Mass Pike,^{[citation needed]} Main Street in Waltham and also Boston Post Road in Wayland and Sudbury.
• In the state of New York, part of US 20 follows the old Cherry Valley Turnpike and is still referred to by that name in some places.
• In the Buffalo area, US 20 follows three busy roads: Broadway (east of Depew), Transit Road, and Southwestern Boulevard.
• From Buffalo westward to Cleveland, Ohio, US 20 follows the path of the Buffalo Stage Road.^[7]
• In Erie, Pennsylvania, it is known as 26th Street.
• From Painesville, Ohio westward to downtown Willoughby, Ohio, it is known as Mentor Avenue; through downtown Willoughby, it follows Erie Street; to the west, it follows Euclid Avenue to Public Square in Cleveland. On the west side of Cleveland and its western suburbs, it is known as the Cleveland Memorial Shoreway, Clifton Boulevard, or Center Ridge Road.

One of the 1842 milestones marking the original Western Reserve and Maumee Turnpike in Woodville, Ohio.

• Between Fremont, Ohio and Perrysburg, Ohio, the road dates back to the late 1830s. It was known then as the Maumee and Western Reserve Road. Nicknamed "Mud Pike" and earned a reputation as "The worst road on the continent" for the mudholes that would trap wagon wheels and slow draft animals. Travelers sometimes would take three days to travel 1 mile (1.6 km).
• Through western Indiana, US 20 was built as the Dunes Relief Road, as it bypassed the heavily-traveled Dunes Highway.
• On the south side of Chicago it is 95th Street, through the west suburbs it is LaGrange Road and Mannheim Road (along with US 12 and US 45) and through the northwest suburbs of Chicago it is called Lake Street. Northwest of Chicago it is called Ulysses S. Grant Highway.

See also[link]

• Massachusetts Route 20A

Bannered and suffixed routes[link]

• U.S. Route 20A in New York
• U.S. Route 20A in Ohio
• U.S. Route 20 Business—Sioux City, Iowa; also passes through South Sioux City, Nebraska
• U.S. Route 20 Business—Fort Dodge, Iowa

Related routes[link]

• U.S. Route 120, became Pennsylvania Route 120 in 1967
• U.S. Route 220
• U.S. Route 320 (now decommissioned, was part of the old Route 26)
• U.S. Route 420 (part of U.S. Route 14 Alternate)

References[link]

Further reading[link]

• Nelson, Mac (2008). Twenty West: The Great Road across America. State University of New York Press. ISBN 978-0-7914-7469-3. http://www.sunypress.edu/details.asp?id=61626. 
• Czarnecki, Michael (1997). Twenty Days on Route 20. FootHills Publishing. ISBN 0-941053-01-6. http://www.foothillspublishing.com/2008/id59.htm. 

External links[link]

Wikimedia Commons has media related to: U.S. Route 20

• Galena Bypass project homepage
• Illinois Highway Ends: US 20
• Indiana Highway Ends: US 20
• In Search of...U.S. Route 20 in Ohio by Michael G. Buettner, February 2006
• US 20 Travelogue in New York @ Empire State Roads
• "On Route 20, Where the Past Is Present": August 11, 2006, article in The New York Times Escapes section.
• Flickr Group for Photos Taken Along Route 20
• US-20 endpoint photos
• Twenty West: The Great Road Across America—book about Route 20

Browse numbered routes
← SH-19	ID	SH-21 →
← MT 19	MT	MT 21 →
← US 18	WY	WYO 22 →
← SR 19	OH	SR 21 →
← PA 19	PA	PA 21 →
← Route 4	N.E.	Route 6 →

v t e United States Numbered Highways 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 40 41 42 43 44 45 46 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 87 89 90 91 92 93 94 95 96 97 98 99 101 163 400 412 425 All Bannered Divided Bypasses Routes in italics are no longer a part of the system. Highlighted routes are considered main routes of the system.