The Lower San Jacinto River watershed is located downstream from Lake Houston Dam and connects to Galveston Bay. It has population of about 148,370 and covers 487 square miles. There are many primary streams within this watershed totaling 310 miles of open streams. There is some tidal water as far up as the Lake Houston Dam and interestingly enough, some saltwater fish. The watershed is heavily industrialized in some portions and is notorious for dioxin and PCB contamination for that segment of the river, primarily due to the presence of the San Jacinto River Waste Pits, a federal Superfund site. There is also a fair amount of barge traffic on this waterway.