republic-os/legal/us/code/title-43/chapter-32b/section-1600c.md

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LegalText	43 U.S.C. § 1600c	Colorado River Floodway	us	united_states_code	code_section	43	PUBLIC LANDS	32B	COLORADO RIVER FLOODWAY	1600c	43 U.S.C. § 1600c	current	119-100	2026-06-26	official	https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc43@119-100.zip	/us/usc/t43/s1600c	data/legal/raw/us/code/title-43/usc43.xml	6906ab5cb605f301a46a6fb081a3e894bfc1f986ce44677ef80f44e2f7535179	d46a16361aa9d10bbc4b27ea0561882d240801c965a2700a4b7cf5f02f552a5f	0d14b3a610b65d549a5d9828bd9d425b65f9364715e0d5b31178dd1a5da102a7	2026-07-04	official	legal us-code

43 U.S.C. § 1600c - Colorado River Floodway

Text

(a) Establishment There is established the Colorado River Floodway as identified and generally depicted on maps that are to be submitted by the Secretary.

(b) Study of tributary floodflows; determination of Floodway boundary Within eighteen months after October 8, 1986, the Secretary, in consultation with the seven Colorado River Basin States, represented by persons designated by the Governors of those States, the Colorado River Floodway Task Force, and any other interested parties shall:

(1) complete a study of the tributary floodflows downstream of Davis Dam;

(2) define the specific boundaries of the Colorado River Floodway so that the Floodway can accommodate either a one-in-one hundred year river flow consisting of controlled releases and tributary inflow, or a flow of forty thousand cubic feet per second (cfs), whichever is greater, from below Davis Dam to the Southerly International Boundary between the United States of America and the Republic of Mexico.

(c) Review and modification of boundaries; notice and comment; written justification for decision of Secretary (1) The Secretary shall conduct, at least once every five years, a review of the Colorado River Floodway and make, after notice to and in consultation with appropriate chief executive officers of States, counties, municipalities, water districts, Indian tribes, or equivalent jurisdictions in which the Floodway is located, and others, such minor and technical modifications to the boundaries of the Floodway as are necessary solely to reflect changes that have occurred in the size or location of any portion of the floodplain as a result of natural forces, and as necessary pursuant to subsection (c) of section 1600e of this title.

(2) If, in the case of any minor and technical modification to the boundaries of the Floodway made under the authority of this subsection, an appropriate chief executive officer of a State, county, municipality, water district, Indian tribe, or equivalent jurisdiction, to which notice was given in accordance with this subsection files comments disagreeing with all or part of the modification and the Secretary makes a modification which is in conflict with such comments, the Secretary shall submit to the chief executive officer a written justification for his failure to make modifications consistent with such comments or proposals.

(Pub. L. 99–450, § 5, Oct. 8, 1986, 100 Stat. 1131; Pub. L. 105–362, title IX, § 901(d), Nov. 10, 1998, 112 Stat. 3289.)

Notes

Editorial Notes

Amendments1998—Subsec. (b). Pub. L. 105–362, § 901(d)(1), struck out par. (1) designation, redesignated cls. (i) and (ii) of former par. (1) as pars. (1) and (2), respectively, and struck out former pars. (2) and (3) which related to preparation and filing of maps with congressional committees, Federal, State, and local government agencies, and federally insured financial institutions. Subsec. (c)(1). Pub. L. 105–362, § 901(d)(2), substituted “appropriate chief executive officers of States, counties, municipalities, water districts, Indian tribes, or equivalent jurisdictions in which the Floodway is located,” for “the appropriate officers referred to in paragraph (3) of subsection (b) of this section,”.