A block of rooms have been reserved at the Martin Inn (888-654-9020), which is adjacent to the Madren Center, for the nights of April 2, 3, and 4.
The rooms will be released on Feb 18th so make your reservation before that if you want to stay at the Martin Inn!
The Symposium rate is $99/night ($119/suite),
tell them you are with the Hydrogeology Symposium. They
have a 48 hr cancellation policy.
Other accommodations in the area
These are in the immediate Clemson area:
Courtyard by Marriott
University Inn (formerly the Ramada)