Question: Which is a 47 mile aqueduct in the U.S., Contra Costa Canal or  Pennsylvania Canal
Context: Contra Costa Centre is a census-designated place in Contra Costa County, California.  Contra Costa Centre sits at an elevation of 92 feet (28 m).  The 2010 United States census reported Contra Costa Centre's population was 5,364.  Contra Costa Centre is served by the Pleasant Hill / Contra Costa Centre BART station. John Gioia (pronounced: Joy-a ) is an American politician.  He has served on the Contra Costa County Board of Supervisors in Contra Costa County, California since 1998 and was overwhelmingly re-elected three times.  He served as chair in 2002, 2006 and 2010.  John Gioia is a Democrat.  Contra Costa Supervisory seats are non-partisan. The County Connection (officially, the Central Contra Costa Transit Authority, CCCTA) is a Concord-based public transit agency operating fixed-route bus and ADA paratransit (County Connection LINK) service in and around central Contra Costa County in the San Francisco Bay Area.  Established in 1980 as a joint powers authority, CCCTA assumed control of public bus service within central Contra Costa first begun by Oakland-based AC Transit as it expanded into suburban Contra Costa County in the mid-1970s (especially after the opening of BART). The Contra Costa Times was a daily newspaper based in Walnut Creek, California, U.S..  The paper served Contra Costa and eastern Alameda counties, in the eastern part of the San Francisco Bay Area.  The "Times" also published four other editions under different titles ("West County Times", "East County Times", "San Ramon Valley Times", and "Valley Times") with essentially the same content, serving distinct communities within its circulation area.  In 2007 the Contra Costa Times was merged with Alameda News Group to form a new entity called Bay Area News Group-East Bay (BANG-EB), which is in turn owned by MediaNews Group. The Susquehanna Canal of the Pennsylvania Canal System was funded and authorized as part of the 1826 Main Line of Public Works enabling act, and would later become the Susquehanna Division of the Pennsylvania Canal under the Pennsylvania Canal Commission.  Constructed early on in America's brief canal age, it formed an integral segment of the water focused transportation system which cut Philadelphia-Pittsburgh (pre-railroad) travel time from nearly a month to just four days.  One of the system's navigations, the Susquehanna Canal/division created a mule-towed navigable channel 41 mi along the west bank of the main stem of the Susquehanna River between a lock terminus near the mouth of the Juniata Tributary River and the canal basin at Northumberland.  Meeting the West Branch Canal and the North Branch Canal at Northumberland, it formed a link between the public and private canals upriver and the main east–west Pennsylvania Canal route known as the Main Line of Public Works which was devised to connect Philadelphia to Pittsburgh, southern New York, northern Pennsylvania and Lake Erie using most of the far reaches of the Susquehanna's tributaries. Tinkers Creek Aqueduct is an aqueduct that was constructed to bridge the Ohio and Erie Canal over Tinkers Creek near its confluence with the Cuyahoga River in Valley View, Ohio.  It is a relatively rare surviving example of an Ohio and Erie Canal aqueduct.  It was originally constructed in 1825-1827 by, and re-built due to flood damage in 1845 and 1905.  Tinkers Creek Aqueduct was included in a National Historic Landmark district established in 1966, and it was separately listed on the National Register of Historic Places in 1979.  The original Tinkers Creek Aqueduct was a wood plank, steel truss, and Ashlar-sandstone structure constructed in 1827, south of the present aqueduct's location.  Cuyahoga River and Tinkers Creek flooding caused continual damage to the original aqueduct, so successive structures were built in 1845 and 1905 in the present location.  Today, Tinkers Creek Aqueduct is the only aqueduct which remains of the four original aqueducts in the Cuyahoga Valley.  Of Furnace Run Aqueduct, Mill Creek Aqueduct, Peninsula Aqueduct, and (?  Yellow Creek ?)  Aqueduct; Mill Creek Aqueduct, of newer construction, is the only aqueduct which still carries Ohio and Erie Canal water.  After 102 years of flooding, weathering, and deterioration, Tinkers Creek Aqueduct was removed in 2007.  The National Park Service is currently working on Phase II of the project to reconstruct it from newer materials. Philadelphia and Columbia Railroad (P&CR) (1834) was one of the earliest commercial railroads in the United States, running 82 mi from Philadelphia to Columbia, Pennsylvania, it was built by the Pennsylvania Canal Commission in lieu of a canal from Columbia to Philadelphia; in 1857 it became part of the Pennsylvania Railroad, and its trackage lives on today operated by Norfolk-Southern.  The Philadelphia and Columbia Railroad's western terminus was located near the former ferry site known as Wright's Ferry, in the town once of that name, but now Columbia in Lancaster County.  There the P&CR met with the Pennsylvania Canal—navigations and improvements on the Susquehanna River east bank approximately 30 mi south of Harrisburg, Pennsylvania.  Most of its right-of-way was obtained by the actions of the Pennsylvania Canal Commission which operated the railroad under the various enabling acts of the Pennsylvania legislature known as the Main Line of Public Works in support of a far sighted plan to link the whole state by canals.  With an engineering study reporting back a finding that obtaining sufficient waters to flood the intended 80+ mile canal from Philadelphia to Columbia, the Canal Commission and legislature authorized the railway on the right of way intended for the canal. Pennsylvania Canal and Limestone Run Aqueduct is a historic aqueduct and related sites located at Milton, Northumberland County, Pennsylvania.  The Milton Section was built in 1829-1830, as part of the West Branch Division of the Pennsylvania Canal.  It encompasses 20 contributing structures and 2 contributing sites and consists of the Limestone Run Aqueduct, canal bed, and towpath.  The aqueduct consists of a single span built of stone and wood, 20 ft and a width of 75 ft . The Contra Costa Canal is a 47 mi aqueduct in the U.S. state of California.  Its construction began in 1937, with delayed completion until 1948 due to World War II shortages in labor and materials.  A portion of the canal's right of way has been developed as the Contra Costa Canal Regional Trail, a biking and walking trail, and is managed by the East Bay Regional Park District. Pennsylvania Canal "(or sometimes Pennsylvania Canal system)" refers generally to a complex system of transportation infrastructure improvements including canals, dams, locks, tow paths, aqueducts, and viaducts.  The Canal and Works were constructed and assembled over several decades beginning in 1824, the year of the first enabling act and budget items.  It should be understood the "first use of any railway" in North America was the year 1826, so the newspapers and the Pennsylvania Assembly of 1824 applied the term then to the proposed Right of ways mainly for the canals of the Main Line of Public Works to be built across the southern part of Pennsylvania.  Enacted before Railroads gestated during their infancy, the focus of the act was to create through building a canal system, the capability to ship heavy or bulk goods and connect Philadelphia to Pittsburgh—and "more importantly"—and "beyond" to the "new growth markets" in the developing territories reached by the Ohio River now called the midwest.  Later, when updated in 1837 to reflect the experience of twelve years of toddler-railways, the term was also applied to railroads and new canals to be added to the state transportation system.  As a crowning achievement, the Main Line of Public Works and the Pennsylvania Canal system topped 2100 ft in elevation by erecting the Allegheny Portage Railroad, which used a system of five inclines and five planes on each side of the Eastern Continental Divide at Cresson Pass in Cambria County to actually haul wheeled flat cars, which had halved canal boats placed on them, up and over the Allegheny Front and connect Pittsburgh to the Susquehanna.  When finished in 1834 the trip from Philadelphia to Pittsburgh could be made in 3–5 days, weather conditions depending.
Answer: Contra Costa Canal