Question: What number was almost given to the U.S. Route that travels over the Cairo Mississippi Bridge?

Context paragraphs:
Mark Morris Memorial Bridge: The Mark Morris Memorial Bridge (locally called the North Bridge) is a 2 lane truss bridge across the Mississippi River in the United States.  It connects the cities of Clinton, Iowa and Fulton, Illinois.  The bridge may also be known as the Lyons-Fulton Bridge, which was the name of a predecessor bridge and the name listed on the USGS topographical map.  The town of Lyons, Iowa, was annexed to Clinton in 1895, but the north end of the city is still referred to as Lyons.  The bridge is the terminus of both Iowa Highway 136 and Illinois Route 136.  The 1975 bridge was named in memory Mark Morris, a long time member of the City of Clinton Bridge Commission who died in 1972.  Morris was instrumental in the construction of the 1975 bridge and the City of Clinton Bridge Commission named it in his honor.  The bridge was opened in January 1975, replacing an older span upstream that once carried the Lincoln Highway, U.S. Route 30.)  In 1982, Iowa DOT announced that it would be removing a 20 cent toll from the Gateway Bridge and the Mark Morris bridge beginning January 1983.  Iowa and Illinois agreed to split responsibility for the maintenance of the two bridges with Iowa maintaining the Mark Morris bridge and Illinois the Gateway bridge.

Severn River Bridge: The Severn River Bridge, officially known as the Pearl Harbor Memorial Bridge, is a bridge that crosses the Severn River northwest of the city limits of Annapolis, Maryland.  The bridge serves as part of the John Hanson Highway, which is signed as U.S. Route 50 (US 50) and U.S. Route 301 (US 301).  Maryland Route 2 (MD 2) also traverses the bridge, but no MD 2 signs exist along the section of highway the route traverses.  MD 2 separates from US 50/301 east of the bridge and becomes Governor Ritchie Highway, and to the west of the bridge it leaves the highway along Solomons Island Road.  The bridge serves as the main connection between Annapolis and points east, including the Eastern Shore via the Chesapeake Bay Bridge; however, unlike the rest of US 50/301 in the area, the bridge lacks shoulders and is often a point of traffic congestion and numerous accidents.

Cairo Mississippi River Bridge: The Cairo Mississippi River Bridge is a type of cantilever bridge known as a Steel Truss Through Deck carrying U.S. Route 60 and U.S. Route 62 across the Mississippi River.  Located in the tri-state area of Illinois, Kentucky, and Missouri, it connects Cairo, Illinois at its northern terminus to Bird's Point, Missouri at its southern terminus.  The bridge was most recently closed for renovation from March 16, 2015 to October 13, 2015.

U.S. Route 60 in Illinois: U.S. Route 60 and U.S. Route 62 (US 60/US 62) run for a very short distance within the state of Illinois.  They follow the same road for their entire existence within the state.  They run around Fort Defiance in Cairo.  It runs from the Cairo Mississippi River Bridge over the Mississippi River east to the Cairo Ohio River Bridge over the Ohio River; the Ohio River Bridge also carries US 51.  The bridges cross the two rivers just north of the mouth of the Ohio.

Bird's Point, Missouri: Bird's Point (or Birds Point) is an unincorporated community in Mississippi County, Missouri.  It lies on an island or former island in the Mississippi River, near the confluence of the Ohio and Mississippi Rivers and is situated directly across from Cairo, Illinois.  This is the point where the U.S. Route 60 bridge connects with Cairo, Illinois.

U.S. Route 60: U.S. Route 60 (US 60) is an east–west United States highway, traveling 2,670 mi from southwestern Arizona to the Atlantic coast in Virginia.  Despite the final "0" in its number, indicating a transcontinental designation, the 1926 route formerly ended in Springfield, Missouri, at its intersection with the major US 66.  In fact, US 66 was almost given the US 60 number.

Cairo, Oregon: Cairo is an unincorporated community in Malheur County, Oregon, United States.  Its elevation is 2192 ft above sea level.  It is about 4 mi southwest of Ontario and a half mile north of Cairo Junction, where U.S. Route 20 and U.S. Route 26, running concurrently with Oregon Route 201, turn south towards Nyssa.  Route 201 also continues north from Cairo Junction through Cairo and towards Ontario.

Cairo Ohio River Bridge: The Cairo Ohio River Bridge is a cantilever bridge carrying U.S. Route 51, U.S. Route 60, and U.S. Route 62 across the Ohio River between and Wickliffe, Kentucky and Cairo, Illinois.  Of all the Ohio River crossings, it is the furthest downstream; the Mississippi River can be seen while crossing the bridge and looking westward.

U.S. Route 63 in Missouri: The highway passes south-to-north through Missouri, from Arkansas to Iowa, serving cities such as Rolla, Jefferson City, Columbia, Moberly, Macon, and Kirksville.  Notable routes that are intersected include U.S. Route 60 in Howell County, Interstate 44 at Rolla, U.S. Route 50 (which it shares a concurrency with into Jefferson City south of the Missouri River until it reaches the junction with U.S. 54), U.S. Route 54 (which it overlaps in Jefferson City from the junction with U.S. Route 50 and crosses the Missouri River with on the Jefferson City Bridge), Interstate 70 at Columbia, U.S. Route 24 at Moberly, U.S. Route 36 at Macon, and U.S. Route 136 at Lancaster.

U.S. Route 322 in New Jersey: U.S. Route 322 (US 322) is a U.S. highway running from Cleveland, Ohio east to Atlantic City, New Jersey.  The easternmost segment of the route in New Jersey runs 62.64 mi from the Commodore Barry Bridge over the Delaware River in Logan Township, Gloucester County, where it continues southeast to Atlantic Avenue and Pacific Avenue in Atlantic City, Atlantic County.  The portion of the route between the Commodore Barry Bridge and Route 42 is mostly a two-lane undivided road that is concurrently signed with County Route 536, passing through Mullica Hill and Glassboro.  From Williamstown, US 322 follows the Black Horse Pike, a four-lane road, southeast to Atlantic City.  In Hamilton Township, Atlantic County, US 322 forms a concurrency with U.S. Route 40, continuing with that route all the way to Atlantic City.  US 322 intersects several major roads including U.S. Route 130 and Interstate 295 in Logan Township, the New Jersey Turnpike in Woolwich Township, Route 55 in Harrison Township, Route 42 in Williamstown, Route 50 and U.S. Route 40 in Hamilton Township, the Garden State Parkway in Egg Harbor Township, and U.S. Route 9 in Pleasantville.

Supporting paragraphs: Cairo Mississippi River Bridge U.S. Route 60
Answer: 66