FM830 IS THE only free ramp on the lake. I keep telling myself I'll never return to it, but I'm also not paying $20 to drop a boat in the water.
If you're going on the weekend, bring a lawn chair and a case of beer while you wait in line.
Oh yeah, and if you think Galveston Bay is rough, toss that out the window. Wait until about 10am or so on Conroe and you'll be wishing your were on the bay in 20mph winds instead. It gets ROUUGGGHH
If for whatever reason you decide to put in at Cagle, be very careful. Lots of stumps up that way to ruin your day