2026 Potomac River sewage spill

Plummers Island is a 12-acre Potomac River island in Montgomery County, Maryland, about nine miles upriver from Washington, D.C. The Washington Biologists' Field Club has called the island "the most thoroughly studied island in North America". The island is visible from the American Legion Memorial Bridge of the Capital Beltway, just downriver (east) of the bridge. Scientific study of Plummers Island began in 1899, when botanist Charles Louis Pollard formed the Washington Biologists' Field Club and began the search for a field camp near the club's Washington, D.C. home. The club leased the island in 1901, and bought it seven years later; the island is now owned by the U.S. National Park Service, located within Chesapeake and Ohio Canal National Historical Park.A 2008 issue of the Bulletin of the Biological Society of Washington was dedicated to articles about the flora and fauna of the island. The study of the island's three main plant communities, riparian, terrace, and upland forest, documented 3,012 insect species in 253 families, in 18 orders: Collembola, Odonata, Dermaptera, Blattodea, Phasmatodea, Orthoptera, Psocoptera, Thysanoptera, Hemiptera, Neuroptera, Megaloptera, Coleoptera, Mecoptera, Trichoptera, Lepidoptera, Diptera, Siphonaptera, and Hymenoptera. Another of the studies reported 19 species of freshwater mollusks (7 bivalves, 12 gastropods) in the island's immediate area, bringing the total known for the Middle Potomac River to 42 species. A periodically updated checklist which includes all the vascular plants of the flora, including ferns, fern allies, gymnosperms, and flowering plants, that have ever been reported growing in the wild on the island and its adjacent mainland, totals 885 plant species, of which 704 are native, and 181 naturalized.

Cabin John is a census-designated place and unincorporated area in Montgomery County, Maryland, United States. As of the 2020 census, it had a population of 2,459. Overlooking the Potomac River, it is a suburb of Washington, D.C.

The 1964 U.S. Open was the 64th U.S. Open, held June 18–20 at the Blue Course of Congressional Country Club in Bethesda, Maryland, a suburb northwest of Washington, D.C. Ken Venturi won his only major title, four strokes ahead of runner-up Tommy Jacobs.Jacobs held the 36-hole lead after shooting a 64 (−6) in the second round, tying the U.S. Open record at the time for a round, set by Lee Mackey in 1950. In the third round on Saturday morning, he carded an even-par 70 and retained the lead after 54 holes, two strokes ahead of Venturi, who made up four shots with a 66 (−4). Masters champion Arnold Palmer had led after the first round, but hopes of a grand slam faded with a 75 in the third. Before the final round began on Saturday afternoon, Venturi was advised by doctors to withdraw from the tournament. He was suffering dehydration due to an oppressive heat wave and had to take treatments with tea and salt tablets in between rounds. To play the final round, doctors warned, was to risk heat stroke. Venturi, however, ignored the advice and played on, then shot a 70 to Jacobs' 76 to claim a four-stroke victory. Venturi's score of 206 over the final 54 holes set a new U.S. Open record, as did his score of 136 over the last 36. The win was his first on tour in four years. Future champion Raymond Floyd made his U.S. Open debut this year at age 21 and finished in 14th place. He played the final two rounds on Saturday with Venturi. This was the last time the championship was scheduled for three days (the final two rounds scheduled on Saturday); the next year it was expanded to four days, concluding on Sunday. The Blue Course at Congressional was the longest in U.S. Open history to date, at 7,053 yards (6,449 m). A lack of rainfall in the previous six weeks reduced its effective length, and it played firm and fast.

The American Legion Memorial Bridge, also known as the American Legion Bridge and formerly as the Cabin John Bridge, is a bridge carrying Interstate 495 (Capital Beltway) across the Potomac River between Montgomery County, Maryland and Fairfax County, Virginia in the United States. It is an American Water Landmark. Plummers Island is located immediately downstream of the bridge. The bridge has five traffic lanes in each direction. The outermost lane in each direction is an entrance/exit-only lane for traffic to/from the Clara Barton Parkway in Maryland and the George Washington Memorial Parkway and Georgetown Pike (State Route 193) in Virginia. There are no facilities for pedestrians or cyclists, which are prohibited.

Carderock Springs Historic District is a national historic district located at Bethesda, Montgomery County, Maryland. The district encompasses 275 modernist houses located northwest of Bethesda. It was developed between 1962 and 1966, and was planned to take full advantage of the existing landscape and topography, with curvilinear streets and cul-de-sacs serving wooded, sloping properties.It was listed on the National Register of Historic Places in 2008.

The David Taylor Model Basin (DTMB) is one of the largest ship model basins—test facilities for the development of ship design—in the world. DTMB is a field activity of the Carderock Division of the Naval Surface Warfare Center.

The Union Arch Bridge, also called the "Cabin John Bridge", is a historic masonry structure in Cabin John, Maryland. It was designed as part of the Washington Aqueduct. The bridge construction began in 1857 and was completed in 1864. The roadway surface was added later. The bridge was designed by Alfred Landon Rives, and built by the United States Army Corps of Engineers under the direction of Lieutenant Montgomery C. Meigs.The Union Arch Bridge was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers in 1972 and was listed in the National Register of Historic Places in 1973.

Cabin John-Brookmont was a census-designated place in Montgomery County, Maryland (adjacent to Washington, D.C.) during the 1980 and 1990 censuses, which included the primary communities of Cabin John and Brookmont. The population recorded in 1990 was 5,341 and consisted of 2,168 housing units. The census area disbanded to form Cabin John and Brookmont in 2000. The ZIP codes serving the area are 20816 and 20818.

Langley High School is a public high school within the Fairfax County Public Schools in McLean, Virginia, United States.

Cabin John Creek is a tributary stream of the Potomac River in Montgomery County, Maryland. The watershed covers an area of 26 square miles (67 km2). The headwaters of the creek originate in the city of Rockville, and the creek flows southward for 10.9 miles (17.5 km) to the Potomac River.

The Carderock Division of the Naval Surface Warfare Center is one of eight Naval Sea Systems Command (NAVSEA) Surface Warfare Centers. The headquarters is located in Carderock, Maryland with the historic David Taylor Model Basin. The division includes remote sites across the United States concentrating on engineering, testing and modelling ship and ship's systems for the Navy. It consists of approximately 3,200 scientists, engineers and support personnel working in more than 40 disciplines ranging from fundamental science to applied/in-service engineering.