From MoPac /1325/Burnet Rd: Travel north on FM1325 to Wells Branch Parkway. Turn right.  Go about 2 miles, and turn left at the light, on Wells Port.  If you hit IH35 you've gone too far.  The library is about 1/2 mile on the right, at 15001 Wells Port.  You can't miss it.

From IH35N: Travel north on IH35 to Wells Branch Parkway.  Go under the freeway, heading West.  At the top of the hill, turn right at the light onto Wells Port.   The library is about 1/2 mile on the right, at 15001 Wells Port.  You can't miss it.