USCCB offers a resource on the process of naming a successor to a retiring bishop here.
The moves yesterday in Philadelphia and Savannah (and Denver) certainly impacted the national list of dioceses with bishops serving past the retirement age (reducing it from
9 to 7) and, thanks to Archbishop Chaput being pulled out of Denver, increased the number of U.S. dioceses currently vacant -- that is, not headed by a bishop-ordinary -- from 7 to 8.
For a snapshot of where this stands, the dioceses with bishops serving past the retirement age are currently (from oldest to youngest):
- Manchester, New Hampshire -- Bishop John McCormack turns 76 next month
- Lincoln, Nebraska -- Bishop Fabian Bruskewitz turns 76 in September
- Bismark, North Dakota -- Bishop Paul Zipfel also turns 76 in September
- Rockford, Illionois -- Bishop Thomas Doran turned 75 in February
- Buffalo, New York -- Bishop Edward Kmiec turned 75 in June
- San Francisco -- Archbishop George Niederauer turned 75 in June
- Erie, Pennsylvania -- Bishop Donald Trautman turned 75 in June
Vacant dioceses -- from longest vacancy to most recent -- are:
- Pittsburgh (Byzantine) -- since June 10, 2010 death of Archbishop Basil Schott, OFM
- Fresno, California -- since December 5, 2010 death of Bishop John Steinbock
- Salina, Kansas -- since December 16, 2010 appointment of Bishop Paul Coakley as archbishop of Oklahoma City
- Baker, Oregon -- since January 24 appointment of Bishop Robert Vasa to Santa Rosa, California
- Pensacola-Tallahassee, Florida -- since March 11 retirement of Bishop John Ricard, SSJ
- Steubenville, Ohio -- since May 17 appointment of Bishop Robert Conlon to Joliet, Illinois
- Tyler, Texas -- since July 6 appointment of Bishop Alvaro Corrada del Rio, SJ to Mayaguez, Puerto Rico
- Denver -- since July 19 appointment of Archbishop Charles Chaput, OFM Cap. to Philadelphia
As always, hat tip to David Cheney.