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ID#:8572
Description:This historic image depicted a large weir that had been installed at a Morgan Park, Minnesota waterway near Duluth, in order to measure waste water flow during the 1929 St. Louis River environmental investigation. The “weir method” is a way of determining the volume of a fluid by measuring its flow. This study, and later studies in 1948, and 1973, showed a progressive deterioration of the water quality in the river, as well as in nearby Spirit Lake.
As one of a series of instructional images used by the Minnesota Board of Health to train its state public health workers, the purpose of the photographs and the appropriate training was focused on protecting water supplies from toxic contamination due to the discharge of industrial pollution.
High Resolution: Click here for hi-resolution image (13.42 MB)
Content Providers(s):CDC/ Minnesota Department of Health, R.N. Barr Library; Librarians Melissa Rethlefsen and Marie Jones
Creation Date:1929
Photo Credit:
Links:Minnesota Health Department
Minnesota Health Department; R.N. Barr Library
CDC – Nat. Center for Infectious Diseases; Water-Related Diseases
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.

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