2019-10-28-minutes-public-works-study-session

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nhc N northwest hydraulic consultants NHC Ref. No. 2003112 28 August 2019 Kittitas County Public Works 411 N Ruby Street #1 Ellensburg, WA 98926 Attention: Mark Cook, P.E. Public Works Director Via email: Mark.cook@.co.kittitas.wa.us Re: North Fork Teanaway Road - Lick Creek Fish Passage Enhancement Project Flood Rise Analysis - Maintaining Creek Flows Along Teanaway Road 1 INTRODUCTION PURPOSE: This technical memorandum summarizes the hydraulics assessment that was completed under the direction from Kittitas County Public Works to identify flood rise impacts resulting from maintaining creek flows along Teanaway Road; as part of the North Fork (NF) Teanaway Road, Lick Creek fish passage enhancement project. The Washington State Department of Fish and Wildlife (WDFW) has requested a flood rise analysis on the NF Teanaway Road, Lick Creek fish passage enhancement project, in order to consider granting Kittitas County protections afforded for fish barrier removal projects (RCW 77.55.181). Previously, Kittitas County has promoted reconnecting Lick Creek to the Teanaway River, which would eliminate flooding along the current alignment of Lick Creek downstream of the Teanaway Road crossing. This analysis provides the additional requested information to assist WDFW in assessing whether they will take actions to support the County's original proposed project and streamlined permitting through RCW 77.55.181. BACKGROUND: Kittitas County was awarded Federal Lands Access Program (FLAP) grant funds from FHWA to replace four culverts on Teanaway Road. WDFW approached the County to see if resources and funding could be transferred to address the Lick Creek barrier, which wasn't part of this original funding package. Lick Creek is a top -priority watershed for WDFW, DNR, USFS, and Yakama Nation for salmon recovery. The County coordinated with FHWA to transfer funding and added Lick Creek as a priority, understanding the importance of the culvert replacement. Since that time, collaborative efforts have continued throughout the Lick Creek watershed, including habitat enhancement and bridge replacement projects. This flood analysis included three main tasks: site reconnaissance, hydrologic analysis, and hydraulic analysis; these are discussed in the following sections. The project site is located in Kittitas County, WA, along the NF Teanaway Road, which crosses Lick Creek approximately 17 miles from Cie Elum. Upstream of the project location, Lick Creek flows predominantly