On behalf of the Texas Department of Transportation, SWCA Environmental Consultants (SWCA) conducted an intensive cultural resources survey with systematic shovel testing from July 10–14, 2017 of new and existing right-of-way (ROW) along Farm-to-Market (FM) 45 in San Saba and Mills Counties, Texas. Because the project will receive funding from the Federal Highways Administration, it qualifies as an undertaking as defined in Title 36 Code of Federal Regulations Part 800.16(y) and, therefore, survey was conducted in compliance with Section 106 of the National Historic Preservation Act (54 U.S. Code 306108). Furthermore, the project must also comply with the Antiquities Code of Texas (9 Natural Resources Code 191). Kevin Hanselka served as Principal Investigator under Texas Antiquities Permit No. 8096. The total area of potential effects (APE) is defined as a 12.5-mile-long stretch of FM 45 between the limits outlined above, and includes the existing 100- to 200-foot-wide ROW and an additional 84 acres of new ROW in discontinuous segments along both sides of existing ROW. The total project area is about 264.5 acres, of which about 178 acres is existing ROW, 84 acres is new ROW, and 2.5 acres is proposed easements. Typical depths of impact would range between 3 and 5 feet for pavement and vertical adjustments to the roadway profile. Maximum depths of impacts would reach up to 60 feet at bridge widening/replacement locations. Some areas would require significant (i.e., 5–15 foot) cuts in back slopes to accommodate the new roadway width. Background research determined that two cultural resources surveys have been previously conducted within the APE. Fourteen previously recorded archeological sites and 166 potentially historic structures are located within a 0.6-mile (1-kilometer) radius of the current APE; of these, three archeological sites and three possible historic structures are located within the APE. The field investigations assessed all portions of the APE for which access was granted; however, right-of-entry ...