Under their CSO discharge permit, MSDGC (Metropolitan Sewer District of Greater Cincinnati) is required to measure overflow volumes at each of their Combined Sewer Overflows. The data is reported to Ohio EPA. Data from 2009 (April when the permit was issued) is broken into 3 files as below to make them easier to download.
There are several spreadsheets in each file. The Column “station” refers to the CSO number. The permit (for 2009 to 2013) contains longitude and latitude of each CSO. The most current permit is available on dropbox also.