The San Marcos River is clear because it is fed by a freshwater spring. Not only is this water clear, but it is also extraordinarily clean. It is ten times cleaner than the FDA drinking water requirements. This is because the San Marcos River is fed by freshwater springs near the city of San Marcos.
In the next year an army engineer's report mentioned the Trinity as the deepest and least obstructed river in Texas, said that seven steamboats were in operation in its lower channel, and estimated that navigation was practicable.
Paddle the San Marcos River at NightWhat's more awesome than going kayaking? Doing so at night, of course! With the colorful LED lights of you and your friends' clear kayaks guiding your way, you'll experience floating on the San Marcos River in a whole new way.
Eventually, between 1960 and 1980, as Lake Powell began to fill behind Glen Canyon Dam, the Colorado River stopped flowing regularly to the sea. In the popular imagination, the Colorado River was broken, and its delta was dead. But as it happens, the delta wasn't dead at all.