Adds a new subsection (c) to 16 U.S.C. 2203 establishing rules for preagreement costs: defines 'sponsor' to include State or local governments and Indian Tribes; requires the Secretary (within 180 days of enactment) to identify measures whose costs may be incurred preagreement and to develop a State-level procedure for sponsors to request additional measures; provides that applicable preagreement costs may count toward the sponsor's contribution if an agreement is later entered; states that sponsors assume the risk of incurring such preagreement costs; and clarifies that nothing requires the Secretary to enter into an agreement.