Terracon Consultants, Inc. (Terracon) was retained by IDS Engineering Group (Client) to conduct an intensive pedestrian survey for the proposed Horsepen Bayou Conveyance Improvements project in Houston, Harris County, Texas. Terracon previously conducted a cultural resources desktop assessment for the Client, which was coordinated with the Texas Historical Commission (THC) on March 4, 2019. Since the proposed undertaking will occur on land owned or controlled by a political subdivision of the State of Texas (Harris County Flood Control District), this project was subject to the Antiquities Code of Texas (Texas Natural Resources Code, Title 9, Chapter 191). Additionally, since future phases of this project will trigger regulatory oversight through coordination with the U.S. Army Corps of Engineers (USACE) under Section 404 of the Clean Water Act, it will be subject to provisions of Section 106 of the National Historic Preservation Act (NHPA) (54 USC § 306101). This project was conducted under Antiquities Permit #8974. The project area comprises an approximate six-mile reach along Horsepen Bayou, and associated tributaries, and an approximate 73-acre undeveloped tract. Fieldwork, consisting of pedestrian survey and shovel testing, was conducted from July 22 to July 26, 2019 by Catherine Jalbert (Project Archeologist), Edgar Vazquez (Staff Archeologist), and Michael Hogan (Staff Archeologist), under the oversight of Jennifer Hatchett Kimbell, who served as the Principal Investigator. The report was authored by Catherine Jalbert and Jennifer Hatchett Kimbell. The proposed project area was investigated in compliance with Texas Historical Commission (THC) and Council of Texas Archeologists (CTA) guidelines for archeological survey. No cultural resources were observed within the project area. One property, NASA’s Sonny Carter Training Facility/Neutral Buoyancy Laboratory (Building 920) is adjacent to the project area and has been determined eligible for listing to the National Register of Historic Places (NRHP). However, the THC has determined that the project will have no adverse effect on this property. Considering the absence of other observed cultural resources eligible for inclusion on the NRHP within the project area, Terracon recommended that the proposed project be allowed to proceed as currently designed. The THC concurred with this recommendation on October 4, 2019, and consequently no additional work is required at this time. In the event that human remains or cultural features are discovered during construction, those activities should cease in the vicinity of the remains and Terracon, the THC’s Archeology Division, or other proper authorities should be contacted.