Trackhoes preparing to lower natural gas pipe into
pre-excavated trench.

Welders working on natural gas pipe.

Excavated pit structure with gas pipe running through the middle.


Archeological surveys, excavations, and monitoring at pipeline construction belong among the largest of OCA projects. Major surveys and excavations have been performed by OCA to secure archeological clearance for the following pipeline constructions:

-Transwestern Pipeline Expansion Project conducted for Transwestern Pipeline Company

-Mid-America Pipeline conducted for the Mid-America Pipeline Company

-Cortez CO2 Pipeline conducted for Woodward-Clyde Consultants

-Mid-America Pipeline Western Expansion Loop conducted for Enterprise Products Operating LP

-Bravo CO2 Pipeline conducted for AMOCO Production Company and Bravo Company

-Continental Divide Pipeline conducted for Continental Divide Pipeline Company

-Chevron Pipeline conducted for Chevron Pipeline Company

These projects resulted in the following publications:

Kenneth Brown (1999): Data Recovery along the 1995 MAPCO Four Corners Pipeline (Vols. 2 -5), OCA/UNM Report No. 185-547d

Ronna J. Bradley and Kenneth L. Brown (1998): Cultural Resources along the MAPCO Four Corners Pipeline (Vol. 1), OCA/UNM Report No. 185-547b

Michael P. Marshall, Nancy J. Akins, and Joseph C. Winter (1986): The 1983 Cultural Resources Monitoring and Data Recovery Project for the Cortez CO2 Pipeline in the Las Huertas Valley Area, OCA/UNM Report No. 185-161i, j

Michael P. Marshall (1985): The Excavation of the Cortez CO2 Pipeline Project Sites, 1982-1983, OCA/UNM Report No. 185-161a, c, d, m

Frank E. Wozniak (1985): Across the Caprock: A Cultural Resources Survey on the Llano Estacado and the Canadian River Valley of East Central New Mexico for the Bravo CO2 Pipeline, OCA/UNM Report No. 185-191 (report cover shown below)

Marcia Donaldson (1983): Cultural Resource Inventory along the Proposed Continental Divide Pipeline, OCA/UNM Report No. 185-107 (report cover shown below)

Patrick Hogan and Joseph C. Winter (1981): Test Excavations at Six Sites in the Sevilleta National Wildlife Refuge, Central New Mexico, OCA/UNM Report No. 185-88 (report cover shown below)

Anthropological studies along the Transwestern Pipeline remains, to date, OCA's largest project ever conducted. Archeological surveys, excavations, and archival research was performed for the sites along the Arizona-New Mexico-Colorado pipeline owned by Transwestern Pipeline Company, a subsidiary of the ENRON Corporation. The work resulted into a 20-volume publication series. See Volume XI (report cover shown below) and all other volumes in the series (see List of OCA Publications).