Spider has a public launch at the river mouth however its very very weedy and shallow. Last year the water was to low to use it. You can also pay $10 to launch at the Pine Forest Lodge. Most rocks are marked but not all and there is a sand bar on the main basin that comes off a point that is unmarked. If you hit it you could always get out and push. A couple good sized stumps too as the river used to be used by the loggers and some left over trees still remain. Just take proper precautions and you should have no problem getting around.