I’ve located this “study” done by the City of Boulder Transportation department, apparently around Spring of 2001.
Not commenting on the study for the time being, it states that red light camera locations are:
Arapahoe Avenue/28th Street Westbound.
Arapahoe Avenue/28th Street Southbound.
Valmont Road/47th Street Westbound.
Table Mesa Drive/Foothills Parkway West Ramp Westbound.
28th Street/Canyon Boulevard Northbound.
28th Street/Canyon Boulevard Southbound
I’ll e-mail the transportation department and see if there have been any additional/deletions.