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The Breeding Bird Survey (BBS) provides the most reliable information for this species. BBS data show a steep, persistent decrease in populations between about 1970 and 2000, followed by a slower decline since 2000. The overall rate of decline has resulted in a population loss of 95% since about 1970. However, roadside surveys like the BBS are not an ideal design for Bank Swallows firstly due to their colonial nesting habits, and secondly because their primary nesting habitats (pits, rivers and lakeshores) are not well represented on roadsides. In addition, the precision of the BBS results is only moderate. Therefore the overall status reliability is medium. BBS data from throughout North America suggest that Bank Swallow populations are also decreasing at the continental level.
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis
Additional information on: Breeding Bird Survey in North America (BBS) - U.S. analyses