SECTION 1. REVISION OF FEASIBILITY AND SUITABILITY STUDIES OF EXISTING 
              NATIONAL HISTORIC TRAILS.

    Section 5 of the National Trails System Act (16 U.S.C. 1244) is 
amended by adding at the end the following:
    ``(g) Revision of Feasibility and Suitability Studies of Existing 
National Historic Trails.--
            ``(1) Definitions.--In this subsection:
                    ``(A) Route.--The term `route' includes a trail 
                segment commonly known as a cutoff.
                    ``(B) Shared route.--The term `shared route' means 
                a route that was a segment of more than one historic 
                trail, including a route shared with an existing 
                national historic trail.
            ``(2) Requirements for revision.--
                    ``(A) In general.--The Secretary of the Interior 
                shall revise the feasibility and suitability studies 
                for certain national trails for consideration of 
                possible additions to the trails.
                    ``(B) Study requirements and objectives.--The study 
                requirements and objectives specified in subsection (b) 
                shall apply to a study required by this subsection.
                    ``(C) Completion and submission of study.--A study 
                listed in this subsection shall be completed and 
                submitted to Congress not later than 3 complete fiscal 
                years from the date funds are made available for the 
                study.
            ``(3) Oregon national historic trail.--
                    ``(A) Study required.--The Secretary of the 
                Interior shall undertake a study of the routes of the 
                Oregon Trail listed in subparagraph (B) and generally 
                depicted on the map entitled `Western Emigrant Trails 
                1830/1870' and dated 1991/1993, and of such other 
                routes of the Oregon Trail that the Secretary considers 
                appropriate, to determine the feasibility and 
                suitability of designation of one or more of the routes 
                as components of the Oregon National Historic Trail.
                    ``(B) Covered routes.--The routes to be studied 
                under subparagraph (A) shall include the following:
                            ``(i) Whitman Mission route.
                            ``(ii) Upper Columbia River.
                            ``(iii) Cowlitz River route.
                            ``(iv) Meek cutoff.
                            ``(v) Free Emigrant Road.
                            ``(vi) North Alternate Oregon Trail.
                            ``(vii) Goodale's cutoff.
                            ``(viii) North Side alternate route.
                            ``(ix) Cutoff to Barlow road.
                            ``(x) Naches Pass Trail.
            ``(4) Pony express national historic trail.--The Secretary 
        of the Interior shall undertake a study of the approximately 
        20-mile southern alternative route of the Pony Express Trail 
        from Wathena, Kansas, to Troy, Kansas, and such other routes of 
        the Pony Express Trail that the Secretary considers 
        appropriate, to determine the feasibility and suitability of 
        designation of one or more of the routes as components of the 
        Pony Express National Historic Trail.
            ``(5) California national historic trail.--
                    ``(A) Study required.--The Secretary of the 
                Interior shall undertake a study of the Missouri 
                Valley, central, and western routes of the California 
                Trail listed in subparagraph (B) and generally depicted 
                on the map entitled `Western Emigrant Trails 1830/1870' 
                and dated 1991/1993, and of such other and shared 
                Missouri Valley, central, and western routes that the 
                Secretary considers appropriate, to determine the 
                feasibility and suitability of designation of one or 
                more of the routes as components of the California 
                National Historic Trail.
                    ``(B) Covered routes.--The routes to be studied 
                under subparagraph (A) shall include the following:
                            ``(i) Missouri valley routes.--
                                    ``(I) Blue Mills-Independence Road.
                                    ``(II) Westport Landing Road.
                                    ``(III) Westport-Lawrence Road.
                                    ``(IV) Fort Leavenworth-Blue River 
                                route.
                                    ``(V) Road to Amazonia.
                                    ``(VI) Union Ferry Route.
                                    ``(VII) Old Wyoming-Nebraska City 
                                cutoff.
                                    ``(VIII) Lower Plattsmouth Route.
                                    ``(IX) Lower Bellevue Route.
                                    ``(X) Woodbury cutoff.
                                    ``(XI) Blue Ridge cutoff.
                                    ``(XII) Westport Road.
                                    ``(XIII) Gum Springs-Fort 
                                Leavenworth route.
                                    ``(XIV) Atchison/Independence Creek 
                                routes.
                                    ``(XV) Fort Leavenworth-Kansas 
                                River route.
                                    ``(XVI) Nebraska City cutoff 
                                routes.
                                    ``(XVII) Minersville-Nebraska City 
                                Road.
                                    ``(XVIII) Upper Plattsmouth route.
                                    ``(XIX) Upper Bellevue route.
                            ``(ii) Central routes.--
                                    ``(I) Cherokee Trail, including 
                                splits.
                                    ``(II) Weber Canyon route of 
                                Hastings cutoff.
                                    ``(III) Bishop Creek cutoff.
                                    ``(IV) McAuley cutoff.
                                    ``(V) Diamond Springs cutoff.
                                    ``(VI) Secret Pass.
                                    ``(VII) Greenhorn cutoff.
                                    ``(VIII) Central Overland Trail.
                            ``(iii) Western routes.--
                                    ``(I) Bidwell-Bartleson route.
                                    ``(II) Georgetown/Dagget Pass 
                                Trail.
                                    ``(III) Big Trees Road.
                                    ``(IV) Grizzly Flat cutoff.
                                    ``(V) Nevada City Road.
                                    ``(VI) Yreka Trail.
                                    ``(VII) Henness Pass route.
                                    ``(VIII) Johnson cutoff.
                                    ``(IX) Luther Pass Trail.
                                    ``(X) Volcano Road.
                                    ``(XI) Sacramento-Coloma Wagon 
                                Road.
                                    ``(XII) Burnett cutoff.
                                    ``(XIII) Placer County Road to 
                                Auburn.
            ``(6) Mormon pioneer national historic trail.--
                    ``(A) Study required.--The Secretary of the 
                Interior shall undertake a study of the routes of the 
                Mormon Pioneer Trail listed in subparagraph (B) and 
                generally depicted in the map entitled `Western 
                Emigrant Trails 1830/1870' and dated 1991/1993, and of 
                such other routes of the Mormon Pioneer Trail that the 
                Secretary considers appropriate, to determine the 
                feasibility and suitability of designation of one or 
                more of the routes as components of the Mormon Pioneer 
                National Historic Trail.
                    ``(B) Covered routes.--The routes to be studied 
                under subparagraph (A) shall include the following:
                            ``(i) 1846 Subsequent routes A and B (Lucas 
                        and Clarke Counties, Iowa).
                            ``(ii) 1856-57 Handcart route (Iowa City to 
                        Council Bluffs).
                            ``(iii) Keokuk route (Iowa).
                            ``(iv) 1847 Alternative Elkhorn and Loup 
                        River Crossings in Nebraska.
                            ``(v) Fort Leavenworth Road; Ox Bow route 
                        and alternates in Kansas and Missouri (Oregon 
                        and California Trail routes used by Mormon 
                        emigrants).
                            ``(vi) 1850 Golden Pass Road in Utah.
            ``(7) Shared california and oregon trail routes.--
                    ``(A) Study required.--The Secretary of the 
                Interior shall undertake a study of the shared routes 
                of the California Trail and Oregon Trail listed in 
                subparagraph (B) and generally depicted on the map 
                entitled `Western Emigrant Trails 1830/1870' and dated 
                1991/1993, and of such other shared routes that the 
                Secretary considers appropriate, to determine the 
                feasibility and suitability of designation of one or 
                more of the routes as shared components of the 
                California National Historic Trail and the Oregon 
                National Historic Trail.
                    ``(B) Covered routes.--The routes to be studied 
                under subparagraph (A) shall include the following:
                            ``(i) St. Joe Road.
                            ``(ii) Council Bluffs Road.
                            ``(iii) Sublette cutoff.
                            ``(iv) Applegate route.
                            ``(v) Old Fort Kearny Road (Oxbow Trail).
                            ``(vi) Childs cutoff.
                            ``(vii) Raft River to Applegate.''.
Amends the National Trails System Act to direct the Secretary of the Interior to: (1) revise the feasibility and suitability studies for certain existing National Historic Trails for consideration of possible additions to such trails; and (2) study the feasibility and suitability of designating certain routes and cutoffs as components of the Oregon, Pony Express, California, and Mormon Pioneer National Historic Trails and as shared components of the California and Oregon National Historic Trails.
A bill to amend the National Trails System Act to require the Secretary of the Interior to update the feasibility and suitability studies of four national historic trails, and for other purposes.