Our team of professionals at LEI Engineering and Surveying of Oregon provides a full range of innovative and cost-effective solutions for our clients from design and preparation groundwork to ongoing support until the project is successfully completed. We take great pride at LEI Engineering and Surveying of Oregon in our ability to value engineer projects to provide clients with the best and most effective design solutions. Following is a selection of projects LEI has recently completed.
LEI worked as an integral part of the Bond oversight team and in concert with the design engineer to collect data for these projects. Specifically, LEI completed several ALTA and topographic surveys for use in design of expansion projects.
In early 2020, LEI completed a partition for school district property to better interface school property to adjacent private land owners.
The existing structure at this crossing was a 10-foot span box culvert that was providing minimal to no fish passage. Due to site constraints, a bridge was not possible at this location. LEI worked with the BLM Hydraulics Resource Specialist to determine the channel width that needed to be spanned by a structural plate arch drainage structure. During this discussion and analysis, it was determined that not only should the structure span the 35'+ active channel width, but a 9-foot width low water channel should be included along the river thelweg to provide adequate depth for fish passage during low flow conditions. It was also determined that the channel design through the structure should provide boulders and large woody debris to simulate the natural river channel.
The developed design incorporated these hydraulic and stream geomorphology components to provide both an economically feasible and environmentally friendly crossing.
LEI Engineering & Surveying of Oregon completed the surveying and design for a medium sized fish stream crossing on Savage Creek for access to a logging operation. The crossing was located in steep and environmentally sensitive forested terrain in southern Oregon, near Grants Pass. The portion of the savage creek drainage tributary to this crossing was 3.97 square miles and produced a 50-year storm flow of 450 cfs.
A 142" x 91" corrugated pipe arch was selected and designed as the permanent structure for this site, replacing a temporary railroad car bridge that had been used to access the area for logging activities.
LEI followed current Oregon Department of Forestry guidelines for the design of the new structure.