The Level 1.5 method is a limited-detail method that is used for quick estimates of bridge scour. The method was developed by the U.S. Geological Survey in Montana and was used to estimate scour depths at 215 bridge sites located on secondary roads throughout North Dakota. The estimated scour depths are presented in tabular form.
Additional publication details
USGS Numbered Series
Estimated level 1.5 bridge scour at selected sites in North Dakota, 1999-2002