Allegheny River Lock and Dam No. 3

Cheswick is a borough in Allegheny County, Pennsylvania, United States, along the Allegheny River. The population was 1,672 as of the 2020 census. Cheswick Borough was incorporated in 1902. It is a residential suburb of the Pittsburgh metropolitan area.

Acmetonia is a community within Harmar Township, Allegheny County, Pennsylvania, United States. Acmetonia Primary School as well as the Allegheny Valley School District administrative offices are located on Pearl Avenue in Acmetonia. The natural southern boundary of Acmetonia is the Allegheny River and the primitive Allegheny Islands State Park is nearby. The community is served by the Cheswick post office with the ZIP code of 15024.

The Allegheny Valley School District is a small, suburban, public school district located in Allegheny County, Pennsylvania. It covers Cheswick and Springdale boroughs and Harmar and Springdale townships in Allegheny County, Pennsylvania. The district encompasses approximately 10 square miles (26 km2). According to 2000 federal census data, it serves a resident population of 10,771 people. In 2009, the district residents’ per capita income was $22,071, while the median family income was $45,562. In the Commonwealth, the median family income was $49,501 and the United States median family income was $49,445, in 2010.

The Bessemer & Lake Erie Railroad Bridge is a truss bridge that carries the Canadian National Railway's Bessemer and Lake Erie Railroad division across the Allegheny River between the Pittsburgh suburbs of Plum and Harmar Township, Pennsylvania. In 1897, a single-track trestle and viaduct was built on this site; in 1918, the original piers were doubled in width, the current double-tracked structure built alongside, and then slid into place. The original north trestle approach was buried in slag dumped from an adjacent temporary filling trestle.

Harwick is a census-designated place (CDP) in Allegheny County, Pennsylvania, United States, and is located within Springdale Township. As of the 2020 census, it had a population of 850.

Springdale Township is a township in Allegheny County, Pennsylvania, United States. It contains the two communities of Orrville and Harwick. The population was 1,636 at the 2010 census.

The Allegheny River Turnpike Bridge carries Interstate 76 (Pennsylvania Turnpike) over the Allegheny River. The structure features a pair of twin 2,350’ cast-in-place concrete segmental bridges. This is the first of its type in Pennsylvania. It was constructed between 2007 and 2010 and is the second bridge to stand on this site. The original truss bridge was built between 1949 and 1951 by the engineering firm Modjeski & Masters; the crossing predates the Interstate System by several years. The replacement bridge was designed by the engineering firm Figg and built by Walsh Construction. The purpose of the new structure was to increase the capacity of traffic from two lanes in each direction to three; this was done to eliminate a bottleneck at the exit with Pennsylvania Route 28, which branches off at the bridge approach on the Harmar side of the river.[1] The replacement eastbound bridge opened in November 2009. It carried both eastbound and westbound traffic across the Allegheny River until the project was finished one year later. On Tuesday, July 13, 2010, just after 10 a.m., the old steel structure of the Allegheny River Bridge was imploded with controlled demolition explosives. Roadway traffic was stopped for approximately 15–20 minutes, and river traffic was stopped for 24 hours for cleanup of the debris from the bridge.

The Harwick Mine disaster was a mining accident on January 25, 1904 in Cheswick, Pennsylvania, some sixteen mi (26 km) east of Pittsburgh in the western part of the state. The blast killed an estimated 179 miners and 2 aid workers. The disaster ranks among the ten worst coal mining disasters in American history. One community especially impacted was the Hungarian community in Homestead, Pennsylvania. Fifty-eight of the members of the First Hungarian Reformed Church of Homestead—a full third of the congregation—died in the explosion. Coal was mined by compressed-air machine, blasted down with dynamite. Ice accumulation in the air shaft restricted ventilation which caused a buildup of methane gas. At 8:15 am, workers blasted down dynamite which ignited the methane. Coal dust suspended in the air assisted the explosion in traveling throughout every region of the mine. In addition to interior devastation, the force was so powerful that it wrecked the exterior of the shaft. Of 175 mine workers underground at the time, the single survivor was the severely burned 16-year-old Adolph Gunia. Other casualties included Daniel A. Lyle and the mine engineer Selwyn M. Taylor, who both gave their lives in rescue attempts after responding to the scene. Greatly touched by Taylor's and Lyle's sacrifice, Andrew Carnegie had medals privately minted for their families, and within two months had established a $5 million Carnegie Hero Fund as a result. The mine was owned by the Allegheny Coal Company.

Springdale is a borough in northeastern Allegheny County, Pennsylvania, United States, 18 miles (29 km) northeast of Pittsburgh along the Allegheny River. The population was 3,400 at the 2020 census. The borough became official in 1906, after breaking away from the township.

The Rachel Carson Homestead is a National Register of Historic Places site that is located in Springdale, Pennsylvania, United States, eighteen miles northeast of Pittsburgh and near the Allegheny River.

Allegheny Islands State Park is a 43-acre (17 ha) Pennsylvania state park in Harmar Township, Allegheny County, Pennsylvania in the United States. The undeveloped park is composed of three alluvial islands located in the middle of the Allegheny River northeast of Pittsburgh. The islands are just north of the boroughs of Oakmont and Plum, and southwest of Cheswick. Bridges for the Pennsylvania Turnpike (Interstate 76) and the Bessemer and Lake Erie Railroad Branch of the Canadian National Railway cross the Allegheny River at the middle island.

The 1951 PGA Championship was the 33rd PGA Championship, held June 27 to July 3 at Oakmont Country Club in Oakmont, Pennsylvania, a suburb northeast of Pittsburgh. Sam Snead won the match play championship, 7 & 6 over Walter Burkemo in the Tuesday final; the winner's share was $3,500 and the runner-up's was $1,500.It marked the first time the PGA Championship returned to a venue; Oakmont had hosted in 1922 (at the time, it had also hosted two U.S. Opens and three U.S. Amateurs). It was the third and final win for Snead in the PGA Championship, and the fifth of his seven major titles. At age 39, he was the oldest at the time to win the PGA Championship, passing his old record of two years earlier. Burkemo won the title in 1953 and was runner-up again in 1954. Defending champion Chandler Harper lost in the first round to Jim Turnesa in a match that went to 23 holes. Turnesa, the runner-up to Snead back in 1942, won the title following year in 1952, and displaced Snead as the oldest champion by a few months. Snead's win was the last by a former champion for twenty years, until Jack Nicklaus won his second PGA Championship in 1971. Claude Harmon, Lloyd Mangrum, and Pete Cooper tied for the lowest score in the stroke play qualifier at 142 (−2). Harmon won the $250 medalist prize on the third hole of a sudden-death playoff.The British Open in 1951 was held in the first week of July in Northern Ireland. Its mandatory two-day qualifier was held the same days as the PGA's semifinals and finals, which prevented participation in both events.