23 CFR § 661.43 - Can other sources of funds be used to finance a queued project in advance of receipt of IRRBP funds?

Yes. A Tribe can use other sources of funds, including IRR Program construction funds, on a project that has been approved for funding and placed on the queue and then be reimbursed when IRRBP funds become available. If IRR Program construction funds are used for this purpose, the funds must be identified on an FHWA approved IRR TIP prior to their expenditure.