Four species of non-indigenous Asian carp are expanding their range in U.S. waterways, resulting in a variety of concerns. Three species -- bighead, silver, and black carp -- are of particular note, based on the perceived degree of environmental concern. Current controversy relates to what measures might be necessary to prevent movement of Asian carp from the Mississippi River drainage into the Great Lakes through the Chicago Area Waterway System (CAWS). Contents of this report: Background; Potential Impacts; The CAWS; Federal Response to Asian Carp; Litigation; Canadian Concern; Congressional Interest: Current Legislation; Funding and Authority for Ongoing Actions. Charts and tables. This is a print on demand report.