River Birch (Betula nigra) is a fast-growing deciduous tree that grows to be about 40-70 ft.; growing to be a shorter height with less sunlight. It likes wetter soils, and will even put up with some standing water. It can be grown with many off-shooting stems at a lower height, creating a distinguishing look from other trees with one straight trunk. 
 
Betula nigra is one of the most heat-tolerant and disease free of the birches. It tolerates urban pollution and is often grown around St. Louis City.
 
Maintenance: The bark naturally peels off (exfoliates) and is not a problem. Prune during December-February and avoid pruning in the spring when the sap is running. Prune only when necessary.
 
Height range: 40-70 feet
Spread range: 40-70 feet
Bloom Time and Color: April-May; (males – brown and females – green)
Ideal soil type: Prefers wetter soils (low spots in your yard); tolerates clay and drier soils
Sun Requirements: Full sun to part shade
Wildlife Benefits: One of the top 5 trees that support wildlife in Missouri
 
Source: Missouri Botanical Garden