Starter $9/mo · 10 watches · every 15 min. Plus $19/mo · 40 watches · every 5 min. We email a confirmation link first; webhooks confirm at checkout.
San Marcos River at San Marcos, TX
Latest discharge: 88 cfs (provisional) at .
Latest gage height: 3.7 ft (provisional) at .
The San Marcos gauge at San Marcos. USGS site 08170500 (San Marcos Rv at San Marcos, TX). Open the USGS gauge.
We email once when a fresh USGS reading crosses your line. If it's already past the line, we wait for it to come back and cross. After an alert we stay quiet until the reading moves back past the line by a small margin. Ice, missing, seasonal, or 6-hour-old readings don't count. Provisional readings are labeled in the email.
New to flow numbers? Fly Fishing for Nerds on reading river flows and water temperature for trout.