What is the flow rate of the San Marcos River?

The San Marcos River rises from the San Marcos Springs, the location of the Meadows Center for Water and the Environment, in San Marcos, Texas. The springs are home to several threatened or endangered species, including the Texas blind salamander, fountain darter, and Texas wild rice.



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The speed at which a stream flows is called the stream velocity. A fast river moves at a rate of about 5 miles per hour. The water moves most rapidly in the middle of the channel, where the water is deepest and friction is minimal.

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Flows are at 81 cfs right now.

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The very best levels for tubing are between 100 and 500 cfs.

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The biggest river by discharge volume is the Amazon at an impressive 209,000 cubic meters (7,380,765 cubic feet) per second. The Amazon drains a rainforest while the Mississippi drains much of the area between the Appalachian and Rocky Mountains, much of which is fairly dry.

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The river's normal flow is generally between 150-300 cfs and is constant 72F year-round.

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Coolers and disposable containers are allowed on the San Marcos river. Please no styrofoam. Secure lids on all coolers. Designated access and exits points are located at City Park and Rio Vista for those who bring alcohol to consume while on the river.

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The Everglades is the world's slowest-moving river. When rain fills Lake Okeechobee, in south-central Florida, the lake overflows into the 50-foot wide, 1.5 million acre water filtration system and flows about one meter an hour toward the Gulf of Mexico, at the southern tip of the Sunshine State.

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