Grays Harbor County - Wishkah Road Comprehensive Flood Study Project

Few additional updates:

Final Report for the flood study was issued 5/26/2017 --> Click here.


An additional local drainage investigation was done for two sites - one near Wyman Creek and another near Leutz Road --> Click here.


A Washington Department of Ecology water level gaging station was recently installed near Nisson and is up and running --> Click here.     [Note: This gage has also been incorporated into the Chehalis River Basin Flood Warning System...

From Mark Indrebo:
We held a public meeting last night (5-03-2017) for the Wishkah Comprehensive Flood Study to present our analysis of the flooding sites.  Following meeting materials were used:

Presentation --> Click here.


Summary sheets outline analysis of flooding sites --> Click here.


Meeting invitation --> Click here.


Meeting Agenda --> Click here.

Meeting summary will be prepared and posted soon.

Open House and Pubic Meeting (#3) will be held 5/03/2017.  Read more here.

Update from Larry Karpack (Watershed Science and Engineering):
"We are continuing analyses and hope to have a public meeting in the next few months to discuss the project status and next steps."

 
 From Larry Karpack (Watershed Science & Engineering):
 "Baseline hydraulic modeling and analysis has been completed and inundation frequency-depth-duration data have been produced for seven problem areas along Wishkah Road.  Preliminary estimates of the economic impact  of road closures have been developed and are being used to determine if there are potentially feasible flood reduction projects.  A tide water level gage was installed near Baretich...

From Larry Karpack (Watershed Science & Engineering):
"WSE completed development of a combined topographic surface for the Wishkah River and floodplain. This effort combined channel bathymetric and bank data provided by PGS with new LiDAR collected by GeoTerra defining the remaining floodplain. The new surface was then merged with a topographic surface previously developed for the lower Wishkah River within Aberdeen from the Northshore levee project.  Upstream flow and downstream...

Please join Grays Harbor County and the project team for an update on the Wishkah Road Comprehensive Flood Study Project.
Meeting will be held 10/13/2016 (6 to 8 p.m.) at the Port of Grays Harbor (111 S. Wooding, Aberdeen, WA  98520).  See meeting location here.
Contact Mark Indrebo, Watershed Science & Engineering, 206/521-3000 x105, mark@watershedse.com for more information.
Open House Invitation --> Click here.
Open House Meeting Agenda --> Click here.

Topographic and bathymetric data collection was completed. The topographic and bathymetric surfaces were then merged into a composite surface which will form the basis for the hydraulic modeling. A HEC-RAS 2-dimensional hydraulic model was developed for the study reach (RM 2 to RM 13) including hydrologic inputs of upstream inflows and downstream tidal conditions. The baseline hydraulic model will be used to evaluate conditions along Wishkah Road. 

No substantive updates to add.
Notes from last month's Community Meeting have been added to the Library.  See notes here.

Presentation materials from 6/29/2016 Community Open House have been posted to Library.

Here is link to Library (click here).


Here is direct link to 6/29/2016 presentation (click here).

Please join Grays Harbor County and the project team to learn more about the Wishkah Road Comprehensive Flood Study Project and your role in its success.
Meeting will be held 6/29/2016 (6 to 8 p.m.) at the Port of Grays Harbor (111 S. Wooding, Aberdeen, WA  98520).  See meeting location here.
Contact Mark Indrebo, Watershed Science & Engineering, 206/521-3000 x105, mark@watershedse.com for more information.
Open House Invitation --> Click here.
Open House...

Watershed Science Engineering (WSE) is lead contractor hired by Grays Harbor County (GHC) to do the study. The contract between GHC and WSE was signed April 18, 2016. See here.


GHC and WSE held project kickoff meeting on May 3rd. That meeting was followed by a meeting with the GHCOG to discuss public outreach.


LiDAR data and aerial photography were flown in early May. Data should be available by the end of June. Bathymetric survey data collection for the Wishkah River will start...

Project website for the Wishkah Road comprehensive Flood Study Project has been launched.


Inter-agency funding agreement for completion of Phase II has been signed and is now in effect.  See agreement here.


Submittal deadline on Grays Harbor County's Request for Qualifications for consulting expertise to implement the comprehensive flood study project closed March 11, 2016.  See RFQ here.