These trails run along the river within the city limits. Most of the trails seemed to be cut by the Border Patrol.
The trail starts at the park by Bridge 1 and it goes all the way up to the CPL Electic plant.
Most of the trails are dirt roads with some nice single track as you get within a mile south of the CPL plant. There are also some single track trails closer to the start of the trails on the south side of Laredo. You will see their trail heads as you ride on the dirt roads.
How to get there:
The best place is to park in the park by bridge 1. Then ride west underneath the railroad bridge into the US. From there you will see trail heads. It seems all trails lead up the river.
The Border Patrol make their rounds on these trails so watch out for their trucks and they maybe on