Upcoming Events

April 1 

Austin - "Creating Vibrant Green Cities: Lessons from Seoul South Korea and San Marcos" part of the Imagine Austin Speaker Series - Details


April 4

Boerne - 25th Annual Cibolo Nature Center Mostly Native Plant Sale (members only pre-sale April 3 from 5-7pm) - Details


April 4

San Antonio - Rain Barrel Workshop - Details


April 7-9

Dallas - Rainwater University 2015 by Texas A&M AgriLife - Who should attend: Texas Flood Plain Managers, Landscape Professionals, Engineers, Architects, Homeowners, Business Owners, Builders, School Districts, City, State and Federal Personnel - Details


April 9 

Fredericksburg- Water Conservation Expo, co-hosted by HCA. Details


April 9

Six-county wildlife program and tour by Texas Agri-Life Extention - Participating counties: Mason, Menard, McCulloch, Llano, Gillespie & Kimble - Details


April 18 

Junction - Oasis Pipeline Wildfire Recovery Workshop - Details


April 22

Jourdanton - Agri-life Workshop - Presentations by HCA's Sky Jones Lewey, Rainwater Harvesting Expert John Kight and more - Detail


April 23-24

Kerrville - The second annual Bennett Land Stewardship: “Keys to Hill Country Living" - Details


April 24-26

Fredericksburg - 5th Annual Wings Over the Hills Nature Festival - Details 


April 24-27

Marble Falls - 15th Annual Balcones Songbird Festival - Details 


May 29

San Marcos - Addressing Conflict with deer in our communities, hosted by TPWD, TWA and TSU - Details

San Marcos Watershed

San Marcos Watershed Initiative: a watershed protection plan for the Upper San Marcos River

The Upper San Marcos River is one of the most biologically diverse aquatic ecosystems known in the southwestern United States and has a number of endemic species that are isolated to the upper 4.5 miles of the river. The San Marcos River is an ecologically unique spring-fed ecosystem located along the margin of the Edwards Plateau in central Texas. Spring Lake, located in the City of San Marcos on the campus of Texas State University is the headwaters of the San Marcos River where artesian spring water from the Edwards Aquifer emerges into the lake from approximately 200 openings. This spring system in the second-most productive in the state. In recorded history San Marcos Springs has never run dry.

San Marcos Springs is a conduit through which run ancient waters of the Edwards Aquifer combined with rainfall entering in the recharge zone through fissures in the limestone of the Texas Hill Country. The Upper San Marcos River flows only 4.5 miles from the the headwaters in Spring Lake to the confluence with the Blanco River. Other than the springs there are four tributaries to the Upper San Marcos River. They are: Sink Creek, Sessom Creek, Purgatory Creek, and Willow Creek. All of these plus Spring Lake and its groundwater form the Upper San Marcos River watershed.

Additional information on this watershed can be found at:

 The San Marcos Observing System

The Meadows Center for Water and the Environment Spring Lake Watershed Characterization Project