This is a service / maintenance or supply contract in Chehalis, Washington. Contact the soliciting agency for additional information.

The selected consultant is to provide Annual Hydrologic, Hydraulic, and Geomorphic Services on public works projects. This may include but is not limited to providing hydrologic analysis, hydraulic analysis, geomorphic analysis, environmental permit assistance, and/or similar work. General Scope of Services: Hydrologic Analysis – perform floodplain studies and hydrologic analysis, evaluate and design structures for stormwater retention, detention and/or treatment, provide analysis of drainage basins using various techniques and computer models to calculate streamflow, delineate subbasin boundaries, develop hydrologic models, and run models to simulate existing condition flows for appropriate sizing of water crossing structures. Hydraulic Analysis – perform hydraulic analysis of bridges, including hydraulic conveyance floodplain impacts, foundation scour analysis, sediment transport analysis using one and two dimensional modeling depending on the application, evaluate existing and proposed bridges and culverts, design bank/scour protection, and river retraining structures, evaluate channel improvement effects/impacts of scour/bank protection and river training structures, perform zero rise analysis for proposed projects. Geomorphic Analysis – perform stream investigation and analysis using principles of fluvial geomorphology, perform sediment transport analysis. Environmental Permit Assistance – conduct field inspections to examine the characteristics of creeks, culverts, and surrounding floodplain with respect to hydraulic, erosion, and scour processes, identify reference reaches for water crossing structures and characterize sediment size, estimate channel/floodplain roughness, document lateral and longitudinal erosion, and other relevant information to aid in the assessment and design of water crossing structures, provide conceptual design inputs for water crossing structures, including stream alignment, typical sections, bank full widths, profiles, streambed substrate, bank/channel stabilization elements, and other pertinent information to meet design criteria, prepare plans, reports and maps to assist with environmental permit applications, engineering report requirements for maintenance and/or grant funded culvert projects, and pre-project meetings with various regulatory agencies. CONSULTANTS desiring consideration shall electronically submit a complete SOQ packet for Hydrologic, Hydraulic, and Geomorphic Services in OpenGov. SOQ are limited to ten (10) pages, single sided. Material submitted in excess of this limit (cover page, additional maps, additional resumes, etc.) will not be forwarded for evaluation. SOQs must be submitted electronically in OpenGov. The agreement(s) will be for two (2) years in duration with an option to extend for an additional year by mutual agreement. The agreement amount is not anticipated to exceed $350,000. Question Submission Deadline: January 30, 2026, 2:00pm Question Response Deadline: February 3, 2026, 4:30pm