Problem
How did the low grass-covered area below the Washington Avenue Bridge originally form? (This is the area once known as Bohemian Flats.) Group of answer choices This area formed as a flat eroded bedrock surface created when an ancient waterfall cut through bedrock as it retreated up the river valley. This area originally formed as point bar deposits where the speed of waterflow naturally slowed along the inner banks of river bends. This area formed as natural levees formed when past floodwaters breached the river's banks to deposit new sediment to line the channel. This area originally formed as artificial levees constructed to reduce river floods by building up the riverbanks to hold back more water. This area formed as sediment was deposited on the channel floor of a much larger older river system that once covered the entire valley.