1863 Town of Matagorda at mouth of Colorado River, on mainland
1883 First bathymetry survey of Matagorda Bay
1915 Matagorda Bay has become more shallow because of Colorado River sediments
1927 Colorado River Delta prograded half way across Matagorda Bay, forming a peninsula
1958 Colorado River Delta prograded to barrier island, peninsula divides Matagorda Bay into East and West Bays
We can document the growth of the Colorado River based on historic maps. These maps demonstrate that the Lower Colorado delta prograded 5 miles in 100 years, an average rate of more than 250 feet per year!