Question: Where does the river by the city where the Southeast Library designer died and the Ohio River meet?

Knowledge 1: Southeast Library
Southeast Library's building was designed by master architect Ralph Rapson and originally functioned as a credit union for university and state employees. It opened as a library in 1967. The State Capitol Credit Union building at 1222 Fourth Street Southeast was purchased to be converted into a library on December 29, 1966. It opened as the new Southeast Library on December 26, 1967. [SEP] Knowledge 2: Riverside Plaza
Riverside Plaza is a modernist and brutalist apartment complex designed by Ralph Rapson that opened in Minneapolis, Minnesota in 1973. Situated on the edge of downtown Minneapolis in the Cedar-Riverside neighborhood, and next to both the University of Minnesota's West Bank and Augsburg University, the site contains the 39-story McKnight Building, the tallest structure outside of the city's central business district. Initially known as Cedar Square West, exterior shots of the complex were featured on television as the residence of Mary Richards in sixth and seventh seasons of "The Mary Tyler Moore Show". [SEP] Knowledge 3: Minneapolis
Minneapolis lies on both banks of the Mississippi River, just north of the river's confluence with the Minnesota River, and adjoins Saint Paul, the state's capital. The city is abundantly rich in water, with 13 lakes, wetlands, the Mississippi River, creeks and waterfalls; many connected by parkways in the Chain of Lakes and the Grand Rounds National Scenic Byway. It was once the world's flour milling capital and a hub for timber. The city and surrounding region is the primary business center between Chicago and Seattle. As of 2018, Minneapolis was home to 6 Fortune 500 companies, and the Twin Cities were the fifth-largest hub of major corporate headquarters in the United States. As an integral link to the global economy, Minneapolis is categorized as a global city. [SEP] Knowledge 4: Ohio River
The river then follows a roughly southwest and then west - northwest course until Cincinnati, before bending to a west - southwest course for most of its length. The course forms the northern borders of West Virginia and Kentucky; and the southern borders of Ohio, Indiana and Illinois, until it joins the Mississippi River at the city of Cairo, Illinois.
Knowledge 1: Southeast Library
Southeast Library's building was designed by master architect Ralph Rapson and originally functioned as a credit union for university and state employees. It opened as a library in 1967. The State Capitol Credit Union building at 1222 Fourth Street Southeast was purchased to be converted into a library on December 29, 1966. It opened as the new Southeast Library on December 26, 1967. [SEP] Knowledge 2: Riverside Plaza
Riverside Plaza is a modernist and brutalist apartment complex designed by Ralph Rapson that opened in Minneapolis, Minnesota in 1973. Situated on the edge of downtown Minneapolis in the Cedar-Riverside neighborhood, and next to both the University of Minnesota's West Bank and Augsburg University, the site contains the 39-story McKnight Building, the tallest structure outside of the city's central business district. Initially known as Cedar Square West, exterior shots of the complex were featured on television as the residence of Mary Richards in sixth and seventh seasons of "The Mary Tyler Moore Show". [SEP] Knowledge 3: Minneapolis
Minneapolis lies on both banks of the Mississippi River, just north of the river's confluence with the Minnesota River, and adjoins Saint Paul, the state's capital. The city is abundantly rich in water, with 13 lakes, wetlands, the Mississippi River, creeks and waterfalls; many connected by parkways in the Chain of Lakes and the Grand Rounds National Scenic Byway. It was once the world's flour milling capital and a hub for timber. The city and surrounding region is the primary business center between Chicago and Seattle. As of 2018, Minneapolis was home to 6 Fortune 500 companies, and the Twin Cities were the fifth-largest hub of major corporate headquarters in the United States. As an integral link to the global economy, Minneapolis is categorized as a global city. [SEP] Knowledge 4: Davis Island Lock and Dam Site
It is now owned by the West View Water Authority and is used primarily to pump water from the Ohio River, which then goes on to be purified and is used by the surrounding communities for drinking.
Knowledge 1: Southeast Library
Southeast Library's building was designed by master architect Ralph Rapson and originally functioned as a credit union for university and state employees. It opened as a library in 1967. The State Capitol Credit Union building at 1222 Fourth Street Southeast was purchased to be converted into a library on December 29, 1966. It opened as the new Southeast Library on December 26, 1967. [SEP] Knowledge 2: Riverside Plaza
Riverside Plaza is a modernist and brutalist apartment complex designed by Ralph Rapson that opened in Minneapolis, Minnesota in 1973. Situated on the edge of downtown Minneapolis in the Cedar-Riverside neighborhood, and next to both the University of Minnesota's West Bank and Augsburg University, the site contains the 39-story McKnight Building, the tallest structure outside of the city's central business district. Initially known as Cedar Square West, exterior shots of the complex were featured on television as the residence of Mary Richards in sixth and seventh seasons of "The Mary Tyler Moore Show". [SEP] Knowledge 3: Ohio River
The river then follows a roughly southwest and then west - northwest course until Cincinnati, before bending to a west - southwest course for most of its length. The course forms the northern borders of West Virginia and Kentucky; and the southern borders of Ohio, Indiana and Illinois, until it joins the Mississippi River at the city of Cairo, Illinois. [SEP] Knowledge 4: Davis Island Lock and Dam Site
It is now owned by the West View Water Authority and is used primarily to pump water from the Ohio River, which then goes on to be purified and is used by the surrounding communities for drinking.

Answer: at the city of Cairo, Illinois