I am not sure if it is state or federal but I am fairly sure that if you are caught in the river that your motorcycle/ATV can be confisicated and you are subject to a substanical fine.
You may be able to find out more at:
http://www.tpwd.state.tx.us/Cooke County Sheriff (Texas)
Mike Compton
County Jail
301 S. Chestnut
Gainesville, Texas 76240
940- 665-3471
http://www.wildlifedepartment.com/Oklahoma Department of Wildlife Conservation
P.O. Box 53465
1801 N. Lincoln
Oklahoma City, OK 73105
(405) 521-3856
Love County (Oklahoma)
Sheriff's Office
408 W Chickasaw
Marietta, Oklahoma 73448
(405)276-3150
http://www.usace.army.mil/