Hi Paul,
You can get some information from the posts on the Rochester forum. Click on MN forums and scroll down to Rochester. The manor pits are located in Country Club Manor which is a sub-division in NW Rochester. If you go West on 2nd St., the pits are on the North side. They are in the process of development and in about 5-10 years will become a large park and lake owned by the city. The 2nd pit off 2nd St. (behind a large parking lot) is the most popular one and has a good population of panfish.
Good Fishing,
Mike