Large Scale Impediments

Large scale impediments include low-flow dams, improperly placed or sized road and stream crossing culverts or bridges, improperly placed stone ford crossings, and other miscellaneous structures. In general, large scale impediment removals or remediations require detailed design, engineering, hydraulic and hydraulic modeling, and permitting due to the scope and scale of the projects.

For most road/stream crossings, the designs generally follow U.S. Forest Service stream crossing protocols and, to the degree practicable, guided by bankfull channel cross section measurements taken in stable, representative reaches (preferably upstream of the crossing) considered consistent with the anticipated, natural channel morphology of Program streams. County staff provide the consultants with these measurements taken during the Tier II inventories.
Types of Impediments