No grant shall be made under section 6702, 6703, or 6704 of this title for any project having as its principal purpose the channelization, damming, diversion, or dredging of any natural watercourse, or the construction or enlargement of any canal (other than a canal or raceway designated for maintenance as an historic site) and having as its permanent effect the channelization, damming, diversion, or dredging of such watercourse or construction or enlargement of any canal (other than a canal or raceway designated for maintenance as an historic site).
Nothing in this chapter shall be construed to authorize the payment of maintenance costs in connection with any projects constructed (in whole or in part) with Federal financial assistance under this chapter.
Grants made by the Secretary under this chapter shall be made only for projects for which the applicant gives satisfactory assurances, in such manner and form as may be required by the Secretary and in accordance with such terms and conditions as the Secretary may prescribe, that, if funds are available, on-site labor can begin within ninety days of project approval.
No grant shall be made under this chapter for any project for which the applicant does not give assurances satisfactory to the Secretary that the project will be designed and constructed in accordance with the standards for accessibility for public buildings and facilities to the handicapped and elderly under the Act entitled “An Act to insure that certain buildings financed with Federal funds are so designed and constructed as to be accessible to the physically handicapped”, approved August 12, 1968 (42 U.S.C. 4151 et seq.). The Architectural and Transportation Barriers Compliance Board established by the Rehabilitation Act of 1973 (P.L. 93–112) [29 U.S.C. 701 et seq.] is authorized to insure that any construction and renovation done pursuant to any grant made under this chapter complies with the accessibility standards for public bunldings  and facilities issued under the Act of August 12, 1968.