Alaska Risk MAP Program

Community Risk MAP Studies

City and Borough of Sitka


FEMA and the State of Alaska are conducting a coastal Risk MAP Study in the City and Borough of Sitka that began in 2013.

City and Borough of Sitka Risk MAP Discovery Documents
City and Borough of Sitka Risk MAP Coastal Study Documents

Study Scope

The scope of work of the City and Borough of Sitka Risk MAP Study includes (see also the map below):

  • A detailed coastal flood hazard analysis including the collection of storm surge (coastal hydrology) and overland wave height analysis (coastal hydraulics), as well as floodplain boundaries for 1-percent and 0.2-percent-annual-chance (100- and 500-year) flood events. 0.67 miles of Swan Lake will be updated using approximate modeling and 1 mile of Indian River will be redelineated using new LiDAR. The draft maps will be completed in Spring/Summer 2015.
  • Preparation of a regulatory Flood Insurance Study (FIS) Report document to the Community. A FIS is a book that contains information regarding flooding in a community and is developed in conjunction with the FIRM. The FIS, also known as a flood elevation study, frequently contains a narrative of the flood history of a community and discusses the engineering methods used to develop the FIRM. The study also contains flood profiles for studied flooding sources and can be used to determine Base Flood Elevations for some areas.
  • Preparation of a regulatory Flood Insurance Rate Map (FIRM) map for all panels within the Community which identifies the Community's flood zones, base flood elevations, and floodplain boundaries. This map is used to determine where the purchase of flood insurance is required for properties with federally-backed mortgages. The preliminary FIS and DFIRM’s are scheduled to be released in Winter/Spring 2016.
  • Collect LiDAR in Spring/Summer of 2014. This data will be delivered to the community by Sept. 30, 2014.
  • All of the above datasets will be in the in the North American Vertical Datum of 1988.
  • The State and FEMA will provide guidance, feedback, coordination and technical support throughout the Risk MAP Project Life Cycle.

 

Project Status

The project is currently in the production stage. The following table illustrates project status and includes major milestones with dates:

Activity Actual or Projected End Date
Discovery Interview June 5, 2013
Discovery Meeting August 5, 2013
Draft Flood Study Scoping Meeting February 18, 2014
Discovery Report Summer 2014*
Develop Hydraulic Data  March 15, 2015*
Perform Coastal Analysis April 15, 2015*
Draft Work Maps Issued June/July 2015*
Flood Study Review Meeting July/August 2015*
DFIRM Preliminary Date September/October 2015*
Community Coordination & Outreach Meeting / Public Open House October/November 2015*
90-Day Appeal Period Start Date November/December 2015*
90-Day Appeal Period End Date February/March 2106*
Issue Letter of Final Determination May/June 2016*
DFIRM Effective Date November/December 2016*
*All projected dates are subject to revision as the project progresses

 

Map of Sitka Study Scope

The red line denotes the extent of the City and Borough of Sitka coastal mapping study
Sitka Study Scope Map

 

Sitka Discovery
(FEMA Region X Workspace)
  City and Borough of Sitka
PIN Website
  FEMA Region X
Risk MAP Newsletters

For more information contact:

Sally Russell Cox

State of Alaska Risk MAP Coordinator
Division of Community and Regional Affairs
Department of Commerce, Community, and Economic Development
550 West 7th Avenue, Suite 1640, Anchorage, AK 99501-3569
Phone (907) 269-4588 Fax (907)269-4539
Email: sally.cox@alaska.gov