Bench Mark Surveys

Client—Columbia Land Trust

The Columbia Land Trust cares for lands, water and wildlife of the Columbia River region. They restore degraded habitats to help protect indigenous plants and animals while striving to maintain historic uses and promote responsible enjoyment of our natural resources. To date, they have conserved more than 18,000 acres of natural areas, farm and ranch lands, forests and critical habitat in Oregon and Washington. In 2012, Gibbs & Olson was hired to establish NAD83/91 and UTM coordinates and NAVD88 elevations on 13 concrete and brass monuments at various locations along the Columbia River, from Pierce Island down river to Ilwaco, Washington and Astoria, Oregon. In addition to the 13 bench marks, we also performed a topographic survey on 2,800 feet of the Stringtown Road near Ilwaco, Washington. Digital deliverables included aerial photo backed AutoCAD drawings with plotted bench mark locations and point information. In 2013, we were hired to establish UTM coordinates and NAVD88 elevations on 3 temporary bench marks on the upper end of the Elochoman River. An electronic data file was provided in AutoCAD along with the printed drawings.