We took a 6 mile paddling trip down the Lampasas River between Youngsport and Killeen. The water level is perfect so in this particular stretch of river there were no dry spots. The river current was easy, not too fast but a slow moving flow. Winds that day were 18mph SSE so the areas where the river turned toward the wind were extremely tough to move through, so I recommend going on a day with winds under 10mph.
There were quite a few motor boats on the river, but all drivers were very courteous to us and slowed while passing us to minimize wake! We traveled about 6 miles down the river to the FM3481 bridge and got out on the right side which has a parking area under the bridge for another free entrance to the river/lake.
After the bridge, the river runs into Stillhouse Lake. This day was too windy to continue to the lake, but you could get out at any of the Corp of Engineer parks: Cedar Gap is free, Dana Peak and Union Grove are pay entrance parks.
Small parking/turn around area at the river bed, larger parking area at the top of the river road. The road and boat ramp is gravel/mud at the bottom.
No fees or permits required.
Traveling on FM2484, turn at Gravel Crossing Rd, follow it down to the river entrance.