16 U.S.C. § 198
The provisions of the act of the Legislature of the State of Colorado, approved February 19, 1929, ceding to the United States exclusive jurisdiction over the territory embraced and included within the Rocky Mountain National Park, are accepted, and sole and exclusive jurisdiction is assumed by the United States over such territory, saving, however, to the State of Colorado the right to serve civil or criminal process within the limits of the aforesaid park in suits or prosecutions for or on account of rights acquired, obligations incurred, or crimes committed outside of said park; and saving further to the said State the right to tax persons and corporations, their franchises and property on the lands included in said tract; and saving also to the persons residing in said park now or hereafter the right to vote at all elections held within the county or counties in which said tracts are situated; and saving to all persons residing within said park upon lands now privately owned within said park access to and from such lands, and all rights and privileges as citizens of the State of Colorado; and saving to the people of Colorado all vested, appropriated, and existing water rights and rights-of-way connected therewith, including all existing irrigation conduits and ditches. All the laws applicable to places under the sole and exclusive jurisdiction of the United States shall have force and effect in said park. All fugitives from justice taking refuge in said park shall be subject to the same laws as refugees from justice found in the State of Colorado.
16 U.S.C. § 198