Entries - Entry Category: Engineering - Starting with M

The Main Street Bridge was originally constructed in 1924 as a vehicular structure, replaced in 1973, and altered in 1998; it is one of six bridges linking the downtown areas of Little Rock (Pulaski County) and North Little Rock (Pulaski County). As the downtown areas of Little Rock and Argenta (now North Little Rock) developed in the 1880s, it became apparent that a toll-free bridge independent of the railroad bridges across the Arkansas River was needed. Some people supported the idea of a bridge at the foot of Little Rock’s Main Street, while others thought it should start at Broadway. After years of debate and a series of bridge commissions, the Main Street site was adopted, and the Groton Bridge …

Constructed in 1939 by the Memphis District Corps of Engineers for Drainage District Number Seven of Poinsett County, the Marked Tree Siphons were an integral part of the St. Francis River Basin Flood Control Project. The siphons were also a unique application of an engineering structure of their type, designed to lift the flow of the St. Francis River over an earthen levee and deposit it in the river channel on the other side of the levee. In 1917, Drainage District Number Seven of Poinsett County was authorized by the Arkansas General Assembly. The St. Francis River meandered from north to south through the district, which encompassed most of the county east of Crowley’s Ridge, and carried a considerable traffic …

The Memphis-Arkansas Memorial Bridge on Interstate Highway 55 connects Arkansas with Tennessee at Memphis. Since its opening on the morning of December 17, 1949, the span has served as a vital link for automotive traffic to cross the Mississippi River. When the Frisco Bridge was built for railroads in 1892, automobile traffic was not a factor. The Harahan Bridge, the second bridge linking Arkansas and Tennessee, opened in the summer of 1916. Due to increasing numbers of automobiles on both sides of the river, carriageways were hung off both sides of the Harahan in 1917. These provided a single lane for traffic on either side of the bridge. Although Arkansas cars could cross the Mississippi River at Memphis beginning in …

Millwood Dam, which impounds Millwood Lake on the Little River, was constructed between 1961 and 1966 at a cost of $46.1 million as part of a U.S. Army Corps of Engineers (USACE) project to control flooding on the lower Red River, into which the Little River empties near the town of Fulton (Hempstead County). The lake created by the dam spills across the borders of four counties—Sevier, Little River, Howard, and Hempstead—and provides a variety of recreational opportunities for southwestern Arkansas. The 3.3-mile-long, earthen Millwood Dam is the longest of its kind in Arkansas. Millwood Dam, located east of Ashdown (Little River County), was made possible by the federal Flood Control Act of 1946, though opposition within the state and …

In 1976, the Department of Energy and the Solar Energy Research Institute were allotted funds for a Total Energy Solar Photovoltaic Conversion System that would be the largest of its kind in the world. The location chosen for the project was Mississippi County Community College (MCCC), now Arkansas Northeastern College (ANC), in Blytheville (Mississippi County). The project design included the installation of solar panels, as well as additional funding for the college facility. The main purpose of the project was to build an energy-efficient structure and harness solar power from the panels in order to coordinate, monitor, and manage energy production. With the United States facing an energy crisis in the mid-1970s, President Jimmy Carter created a comprehensive energy plan …

Raye Jean Jordan Montague was an internationally registered professional engineer (RPE) with the U.S. Navy who is credited with the first computer-generated rough draft of a U.S. naval ship. The U.S. Navy’s first female program manager of ships (PMS-309), Information Systems Improvement Program, she held a civilian equivalent rank of captain. She was inducted into the Arkansas Black Hall of Fame in 2013 and the Arkansas Women’s Hall of Fame in 2018. In 2017, with the movie Hidden Figures having awakened an awareness of the previously unacknowledged contributions of black engineers and mathematicians in the American defense and space industries, Montague was featured on the television show Good Morning America and dubbed a “real-life hidden figure.” Raye Jordan was born on …