Help!

I have a 50 year old dam and just took the trees off it to get it back in good shape. Part two of the project was going to be to replace a rusty old intake pipe so we could get to full pool (about 4 more feet).

When the contractor arrived to fix the intake pipe, he noticed that it was entirely submerged, and water was only trickling through to the outlet. So he (and I) are assuming that we have blockage somewhere in the pipe.

He tried putting a 10' stick into the top of the pipe and didn't hit anything so we know that the blockage is deeper that that.

Any suggestions on how to clear the blockage? Know anyone who can do it around Ellijay GA?

Thanks!

Josh