The site is just down Riverside Blvd. a bit from the star on the map (didn't know a specific address).
The ramp is at the end of the parking lot. It's an easy ramp to launch, just about the right slope, long dock. But larger boats (over 20ft) may have trouble with the canal depth, which is very shallow. Taking the N canal is best for depth.
Rates start at $5 for small boats (up to 18ft, if I recall correctly). There's a drop box with envelopes, on which you put your license plate and in which you put the money.