To amend the National Trails System Act to clarify Federal authority relating to land acquisition from willing sellers for the majority of the trails in the System, and for other purposes.

Summary: National Trails System Willing Seller Act - Amends the National Trails System Act to: (1) prohibit the federal acquisition of land and interest in land outside the exterior boundaries of any federally administered area, except with the owner's consent, for the Oregon, Mormon Pioneer, Lewis and Clark, and Nez Perce National Historic Trails and the Continental Divide, North Country, Ice Age, and Potomac Heritage National Scenic Trails; and (2) provide that federal authority to acquire fee title shall be limited to an average of not more than one-quarter mile on either side of the Oregon, Mormon Pioneer, Continental Divide, Lewis and Clark, and Nez Perce trails.

Authorizes appropriations to implement the provisions of the Act relating to trails designated by the Act as national scenic or historic trails. Limits funding for the acquisition of land or interests for, or for the development of, the Natchez Trace National Scenic Trail.

 Instructs the administering agency for the Natchez Trace National Scenic Trail to encourage volunteer trail groups' participation in the development of such Trail.

SECTION 1. SHORT TITLE.

    This Act may be cited as the ``National Trails System Willing 
Seller Act''.

SEC. 2. AUTHORITY TO ACQUIRE LAND FROM WILLING SELLERS FOR CERTAIN 
              TRAILS.

    (a) Oregon National Historic Trail.--Section 5(a)(3) of the 
National Trails System Act (16 U.S.C. 1244(a)(3)) is amended by adding 
at the end the following: ``No land or interest in land outside the 
exterior boundaries of any federally administered area may be acquired 
by the Federal Government for the trail except with the consent of the 
owner of the land or interest in land. The authority of the Federal 
Government to acquire fee title under this paragraph shall be limited 
to an average of not more than \1/4\ mile on either side of the 
trail.''.
    (b) Mormon Pioneer National Historic Trail.--Section 5(a)(4) of the 
National Trails System Act (16 U.S.C. 1244(a)(4)) is amended by adding 
at the end the following: ``No land or interest in land outside the 
exterior boundaries of any federally administered area may be acquired 
by the Federal Government for the trail except with the consent of the 
owner of the land or interest in land. The authority of the Federal 
Government to acquire fee title under this paragraph shall be limited 
to an average of not more than \1/4\ mile on either side of the 
trail.''.
    (c) Continental Divide National Scenic Trail.--Section 5(a)(5) of 
the National Trails System Act (16 U.S.C. 1244(a)(5)) is amended by 
adding at the end the following: ``No land or interest in land outside 
the exterior boundaries of any federally administered area may be 
acquired by the Federal Government for the trail except with the 
consent of the owner of the land or interest in land. The authority of 
the Federal Government to acquire fee title under this paragraph shall 
be limited to an average of not more than \1/4\ mile on either side of 
the trail.''.
    (d) Lewis and Clark National Historic Trail.--Section 5(a)(6) of 
the National Trails System Act (16 U.S.C. 1244(a)(6)) is amended by 
adding at the end the following: ``No land or interest in land outside 
the exterior boundaries of any federally administered area may be 
acquired by the Federal Government for the trail except with the 
consent of the owner of the land or interest in land. The authority of 
the Federal Government to acquire fee title under this paragraph shall 
be limited to an average of not more than \1/4\ mile on either side of 
the trail.''.
    (e) North Country National Scenic Trail.--Section 5(a)(8) of the 
National Trails System Act (16 U.S.C. 1244(a)(8)) is amended by adding 
at the end the following: ``No land or interest in land outside the 
exterior boundaries of any federally administered area may be acquired 
by the Federal Government for the trail except with the consent of the 
owner of the land or interest in land.''.
    (f) Ice Age National Scenic Trail.--Section 5(a)(10) of the 
National Trails System Act (16 U.S.C. 1244(a)(10)) is amended by adding 
at the end the following: ``No land or interest in land outside the 
exterior boundaries of any federally administered area may be acquired 
by the Federal Government for the trail except with the consent of the 
owner of the land or interest in land.''.
    (g) Potomac Heritage National Scenic Trail.--Section 5(a)(11) of 
the National Trails System Act (16 U.S.C. 1244(a)(11)) is amended--
            (1) by striking the fourth and fifth sentences; and
            (2) by adding at the end the following: ``No land or 
        interest in land outside the exterior boundaries of any 
        federally administered area may be acquired by the Federal 
        Government for the trail except with the consent of the owner 
        of the land or interest in land.''.
    (h) Nez Perce National Historic Trail.--Section 5(a)(14) of the 
National Trails System Act (16 U.S.C. 1244(a)(14)) is amended--
            (1) by striking the fourth and fifth sentences; and
            (2) by adding at the end the following: ``No land or 
        interest in land outside the exterior boundaries of any 
        federally administered area may be acquired by the Federal 
        Government for the trail except with the consent of the owner 
        of the land or interest in land. The authority of the Federal 
        Government to acquire fee title under this paragraph shall be 
        limited to an average of not more than \1/4\ mile on either 
        side of the trail.''.

SEC. 3. CONFORMING AMENDMENT.

    Section 10 of the National Trails System Act (16 U.S.C. 1249) is 
amended by striking subsection (c) and inserting the following:
    ``(c) Authorization of Appropriations.--
            ``(1) In general.--Except as otherwise provided in this 
        Act, there are authorized to be appropriated such sums as are 
        necessary to implement the provisions of this Act relating to 
        the trails designated by section 5(a).
            ``(2) Natchez trace national scenic trail.--
                    ``(A) In general.--With respect to the Natchez 
                Trace National Scenic Trail (referred to in this 
                paragraph as the `trail') designated by section 
                5(a)(12)--
                            ``(i) not more than $500,000 shall be 
                        appropriated for the acquisition of land or 
                        interests in land for the trail; and
                            ``(ii) not more than $2,000,000 shall be 
                        appropriated for the development of the trail.
                    ``(B) Participation by volunteer trail groups.--The 
                administering agency for the trail shall encourage 
                volunteer trail groups to participate in the 
                development of the trail.''.