; and (2) the population status of the pallid sturgeon, including population trends. (b) Future IRC construction (1) Comments The Secretary shall solicit comments from the public and the Governor of each affected State on proposals to construct additional IRCs. (2) Research and development The Secretary shall conduct further research on IRC design, including any impacts on existing flows and all authorized purposes set forth in the Missouri River Master Manual, to ensure that any construction of IRCs incorporates the best available science. (3) Period The public comment period under paragraph (1) shall be not less than 90 days for each future IRC project. (4) Repairs Subject to the availability of appropriations, the Secretary shall use all existing authorities— (A) to repair dikes and revetments that are impacting flood risk and bank erosion; and (B) to repair or improve water control structures at the headworks of constructed shallow water habitat side channels. (c) Authorized purposes (1) In general If the Secretary determines that IRCs have an adverse impact on an authorized purpose set forth in the Missouri River Master Manual, the Secretary shall take corrective action to address any such adverse impacts. (2) No adverse impact on tonnage To the maximum extent practicable, the Secretary shall ensure that IRCs do not have an adverse impact on tonnage of materials transported on the Missouri River. 1101. Flexibility for projects (a) Goal For each feasibility study initiated by the Secretary on or after the date of enactment of this Act under section 905(a) of the Water Resources Development Act of 1986 ( 33 U.S.C. 2282(a) ), the Secretary shall— (1) establish a goal of completing the feasibility study by not later than 2 years after the date of initiation