Wading Access to Flat

Thinking about doing some stalking after work… Do any of you guys know the best way to access the flat just as you leave Mt P on the IOP connector to your left…? I know how by boat, but saw some guys wading yesterday, and thought it’d fun to try…

i have been told that you park on the side of the road, climb down the rocks and stay close to the bridge as you walk out. supposedly there is a homeless dude that lives underneath there as well. have never personally tried but have been thinking about giving it a whirl. good luck