Are you talking about this course?
From Texas Parks and Wildlife:
Williamson: Williamson County Brushy Creek Regional Park II (regional park) received $517,213 to acquire 37.1 acres by donation to expand and further develop Brushy Creek Regional Trail located east of the City of Cedar Park in the southern area of the county. Proposed development includes a 2.75-mile trail with creek crossing and aquatic viewing area, fishing areas, wetlands improvements, aquatic garden, water fowl feeding area, xeriscape garden, exercise station, nine-hole disc golf course, 10 benches, kiosk, interpretive signs, roadway, parking, and project acknowledgement signs.
From Williamson County:
Construction of Phase 2 of the Brushy Creek Regional Trail will begin this month. Phase 2 will extend the trail east from the Creekside Trail Head at Great Oaks 4,000 feet through Fern Bluff MUD property. Muniz Concrete and Contracting is the contractor on the project. The trail is projected to be open this spring and will cost approximately $467,000. It will be constructed of granite gravel and concrete and will have some interpretive signs.
“Trails for hiking, biking and walking are one of our top priorities, as well as the top priority for the cities and Municipal Utility Districts in and around us,” said Jim Rodgers, director of Williamson County Parks and Recreation.
When all phases are complete, the Brushy Creek Regional Trail is a planned 8-mile project from Cedar Park to IH-35 in Round Rock. The trail was designated as a National Recreational Trail by the National Parks Service in June 2005. Phase 1 of the trail is approximately 3-miles long and runs from the new City of Cedar Park Brushy Creek Lake Park at Parmer Lane to the Creekside Trail Head at the intersection of Brushy Creek Road and Great Oaks Drive. The trail is open from sunrise to sunset and is free to use.