(This measure has not been amended since it was reported to the Senate on June 8, 2003. The summary of that version is repeated here.)
Tualatin River Basin Water Supply Enhancement Act of 2003 - Authorizes the Secretary of the Interior to conduct the Tualatin River Basin water supply feasibility study in order to: (1) identify ways to meet future water supply needs; (2) identify water conservation and water storage measures; (3) identify measures that would improve water quality and enable environmental and species protection; and (4) where appropriate, evaluate integrated water resource management and supply needs.
Limits the Federal share of the costs of the study, which shall be non-reimbursable and non-returnable, to 50 percent of total costs.
Authorizes appropriations.