Question: What 170 mi river, located entirely within the state of Maine, is crossed by the Maine Kennebec Bridge?
Context: The Kennebec River is a 170 mi river entirely within the U.S. state of Maine. China Lake is a lake in Kennebec County, Maine.  Located northeast of the state capital of Augusta, China Lake is situated in the towns of China and Vassalboro.  China Lake has two large basins connected by a narrow neck.  The elongated eastern basin with an average depth of less than 30 ft is entirely within the town of China, and has an irregular shoreline heavily developed with residences and seasonal cottages.  The more nearly circular western basin extending into East Vassalboro is as deep as 85 ft , and shoreline development around the western basin has been discouraged to allow use as a water supply for Waterville and Winslow.  The western basin overflows into Outlet Stream in the town of Vassalboro.  Outlet Stream flows 7 mi north to discharge into the Sebasticook River in Winslow 1 mi upstream of the Kennebec River. Mount Robson Provincial Park is a vast provincial park in the Canadian Rockies with an area of 2,249 km².  The park is located entirely within British Columbia, bordering Jasper National Park in Alberta.  The B.C. legislature created the park in 1913, the same year as the first ascent of Mount Robson by a party led by Conrad Kain.  It is the second oldest park in the provincial system.  The park is named for Mount Robson, which has the highest point in the Canadian Rockies and is located entirely within the park. Newfound Lake is located in Grafton County, New Hampshire, United States.  It is situated in the Lakes Region of central New Hampshire, in the towns of Alexandria, Bridgewater, Bristol, and Hebron.  Its area of 4451 acre places it behind only Lake Winnipesaukee and Squam Lake among lakes located entirely within New Hampshire, and fourth in the state overall, when Umbagog Lake on the Maine border is included.  Newfound Lake is refreshed twice a year by eight underground springs and has 22 mi of shore line.  The lake is about 2.5 mi wide and 6 mi long.  The deepest point is 183 ft .  Major tributaries include the Fowler River and the Cockermouth River.  Its outlet is the Newfound River, flowing through Bristol village into the Pemigewasset River.  The lake volume is 98 billion gallons of water. The Moose River is an 83 mi river in Maine.  Its source ( ) is in Beattie (Maine Township 2, Range 8, WBKP), on the Canada–United States border, which runs along the height of land between the watersheds of the Kennebec River in Maine and the Chaudière River in Quebec.  From there, the river runs east through Attean Pond and Wood Pond, past the town of Moose River, then through Long Pond and Brassua Lake.  The Moose River empties into Moosehead Lake, the source of the Kennebec River, in Rockwood Strip (T1, R1, WBKP).  The International Railway of Maine was built along Moose River in 1889. The Dead River is a 3.5 mi river located entirely within the city limits of Berlin, New Hampshire, in the United States.  It is a tributary of the Androscoggin River, which flows south from Berlin before turning east at Gorham and into Maine, eventually joining the Kennebec River at Merrymeeting Bay.  The Abenaki Indians called the Dead River "Plumpetoosuc", which means "shallow, narrow river". The Maine Kennebec Bridge is a bridge that crosses the Kennebec River between Richmond and Dresden, Maine.  It was built in 2014 to replace the 84-year-old Richmond-Dresden Bridge, a swing bridge that had previously acted as the only method of crossing the river.  The Maine Kennebec Bridge is significantly taller than the old bridge, and was designed for at least 75 feet (22.86 meters) of clearance during high tide, allowing boats to pass without the need for a swing-span design. The Rockland Branch is a railroad from Brunswick, Maine to Rockland, Maine.  A charter was granted in 1849 to build a railway from the Portland and Kennebec Railroad on the west side of the Kennebec River to Rockland.  Construction through the rocky headlands of the Atlantic coast proved more expensive than anticipated.  The Knox and Lincoln Railroad commenced service to Rockland in 1871 using a ferry to cross the Kennebec River between Bath and Woolwich.  The Knox and Lincoln was leased by Maine Central Railroad in 1891, and became Maine Central's Rockland Branch in 1901.  Maine Central purchased the Samoset destination hotel in nearby Glen Cove (a part of neighbouring Rockport) in 1912, and offered direct passenger service for summer visitors from the large eastern cities.  Carlton bridge was completed in 1927 to carry the railroad and U.S. Route 1 over the Kennebec River.  Maine Central sold the Samoset hotel in 1941, and the last Maine Central passenger train to Rockland was on 4 April 1959.  The State of Maine purchased the branch in 1987 to prevent abandonment.  The line has subsequently been operated by the Maine Coast Railroad, the Maine Eastern Railroad, and, beginning in 2016, the Central Maine and Quebec Railway. The Petit Jean River is a 113 mi river in west-central Arkansas.  The river rises in the Ouachita Mountains in northern Scott County; it flows through Logan County and Yell County, defining the border between Yell County and Conway County before reaching its mouth at the Arkansas River north of Petit Jean State Park.  The city of Danville, named after a steamboat that navigated the river in 1840, is the largest settlement on the river.  Blue Mountain Lake, which straddles the border between Logan and Yell Counties, was created when the river was dammed in 1947.  The river is the longest located entirely within the Arkansas River Valley. State Route 135 (SR 135) is part of Maine's system of numbered state highways, located entirely within Kennebec County.  It runs from SR 132 in Monmouth passing U.S. Route 202 (US 202) in Winthrop and ending at the intersection with SR 8 and SR 11 at Belgrade.  The route is 23.48 mi long.
Answer: Kennebec River