ISTEA Integrity Restoration Act

ISTEA Integrity Restoration Act - Authorizes appropriations out of the Highway Trust Fund (other than the Mass Transit Account) for FY 1998 through 2002 for: (1) the National Highway System (NHS); (2) the Surface Transportation Program (STP); and (3) the Federal Lands Highway Program (FLHP), including Indian reservation roads, public lands highways, and parkways and park highways.

(Sec. 6) Modifies the definition of: (1) "Federal-aid system" to mean the NHS; and (2) NHS to mean the Federal-aid highway system established pursuant to Federal highway provisions.

Defines: (1) "highest priority corridor" to mean (with exceptions) any NHS corridor that the Secretary determines has national and international significance, that directly accounts for at least 35 percent of the truck-borne traffic for Canadian and Mexican imports and exports, that has at least 20 percent truck traffic, that directly benefits impoverished areas, that provides multiple intermodal connections, and that connects to military bases; and (2) "highway funds" to mean the funds apportioned to a State for a fiscal year and the funds allocated to a State for the preceding fiscal year for Federal-aid highway and highway safety construction (other than funds made available for the FLHP and for emergency relief).

Modifies provisions regarding Federal-aid systems and the formula for apportionments of NHS funds.

(Sec. 7) Repeals provisions regarding: (1) apportionments for resurfacing, restoring, rehabilitating, and reconstructing the Interstate System (IS); and (2) the transfer of interstate construction apportionments, the transfer of funds for STP projects, and limits on new capacity.

(Sec. 8) Modifies STP provisions regarding the location of projects and allocations of apportioned funds. Authorizes a State, in nonattainment areas for ozone or carbon monoxide, or for PM-10 resulting from transportation activities, or any combination thereof, to obligate STP funds for any congestion mitigation and air quality improvement project or program without regard to any Department of Transportation limitation relating to the type of ambient air quality standard such project or program addresses.

(Sec. 9) Directs that, for purposes of STP and IS provisions, population shall be determined based on the most recent decennial census for which data are available.

(Sec. 10) Repeals provisions regarding: (1) the highway bridge replacement and rehabilitation program; and (2) the congestion mitigation and air quality improvement program.

(Sec. 12) Replaces provisions regarding minimum allocations to States with an apportionment adjustment program to provide that the Secretary shall allocate among the States amounts sufficient to ensure that the ratio of the highway funds of the State to those of all States for the fiscal year is not less than certain listed percentages for the State.

Repeals existing apportionment adjustment programs.