The MSD Pollution Abatement Collection contains seven photographs documenting pollution abatement projects undertaken by the Metropolitan St. Louis Sewer District (MSD) from 1966-1969. Photographs are identified with the project, location, contract number, date, and firm undertaking the work. Photographs show crews at work in various tunnels, as well as above-ground excavating and sheet piling work. Locations include the Locust Street construction shaft, Horseshoe Tunnel at Highway 270/Watkins Creek Pump Station, the cofferdam at Maline Junction Structure, and the Maline Creek Interceptor in the Bissell Point Sewer System. Companies include the G. L. Tarlton Contracting Company, Taylor Brothers, and Horner & Shifrin. Some of the photographs were taken by Sievers Studio. The collection includes one additional label that does not have a matching photograph.