LeMoine, M., Beamer, E. and Hood, G., 2020. Technical summary of 2020 Milltown Island monitoring under contract WDFW #20-15118. Skagit River System Cooperative, La Conner, WA. pp. 9.

This memorandum is a technical summary of the activities related to WDFW contract #20-15118. The
specific tasks of the contract to be completed include: Task 1) survey channel cross sections and profiles,
Task 2) mapping of beaver dams, lodges and channels, Task 3) GIS analysis of tidal channel dynamics,
Task 4) GIS analysis of Milltown Island channel network comparability to reference marsh allometry,
Task 5) monitoring of water levels in and around Milltown, Task 6) regular sampling for juvenile Chinook
salmon over the entire outmigration period in 2020 and Task 7) intensive monitoring of the flood marsh
area. As part of the technical summary, general methods and adaptations to methods are discussed,
and salient results with limited recommendations are also presented in accordance with the stated
contract deliverables. Raw data products either have been provided such as Tasks 1-2, 5-7 or will be
provided as complete final datasets in the near future (Task 3 and 4).
Tasks 1 through 4 were intended to quantify current channel habitat conditions to inform future
restoration need and design across all of Milltown Island including the northern lobe and southern lobe.
GIS mapping and digitization work was completed by Spring of 2020. Channel cross-sections were
completed by May 2020 along with mapping of beaver dams, lodges and channels. All survey work used
an RTK-GPS with ~2cm accuracy. GIS analysis of current and historical (2007 to 2019) tidal channel
dynamics along with all raw data were delivered to WDFW and their contractor Cardno by June 2020