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Open-File Report 2007-1130

Published 2007
Online Only

Scoping of Flood Hazard Mapping Needs for Lincoln County, Maine

By Robert W. Dudley and Charles W. Schalk

Prepared in cooperation with the Federal Emergency Management Agency, Region I and the Maine Floodplain Management Program, State Planning Office.

Background

The Federal Emergency Management Agency (FEMA) developed a plan in 1997 to modernize the FEMA flood mapping program. FEMA flood maps delineate flood hazard areas in support of the National Flood Insurance Program (NFIP). FEMA's plan outlined the steps necessary to update FEMA's flood maps for the nation to a seamless digital format and streamline FEMA's operations in raising public awareness of the importance of the maps and responding to requests to revise them. The modernization of flood maps involves conversion of existing information to digital format and integration of improved flood hazard data as needed. To determine flood mapping modernization needs, FEMA has established specific scoping activities to be done on a county-by-county basis for identifying and prioritizing requisite flood-mapping activities for map modernization. The U.S. Geological Survey (USGS), in cooperation with FEMA and the Maine Floodplain Management Program (MFMP) State Planning Office, began scoping work in 2006 for Lincoln County. Scoping activities included assembling existing data and map needs information for communities in Lincoln County, documentation of data, contacts, community meetings, and prioritized mapping needs in a final scoping report (this document), and updating the Mapping Needs Update Support System (MNUSS) database with information gathered during the scoping process.

The average age of the FEMA floodplain maps in Lincoln County, Maine is at least 17 years. Many of these studies were published in the mid- to late-1980s, and some towns have partial maps that are more recent than their study. However, in the ensuing 15–20 years, development has occurred in many of the watersheds, and the characteristics of the watersheds have changed with time. Therefore, many of the older studies may not depict current conditions nor accurately estimate risk in terms of flood heights or flood mapping.

 

Report

Download the report in Portable Document Format (PDF).

Open-File Report 2007-1130 (PDF–798KB)

 

Contents

  • Section 1. Introduction
    • Background
    • Scope of Work
    • Description of Lincoln County
  • Section 2. Available Flood-Mapping Data and Mapping Needs
    • Community FISs and FIRMs
    • State of Maine Best Available Data (BAD) for Unnumbered A-Zones
    • Letters of Map Change (LOMCs)
    • LOMCs in Lincoln County
    • Community Flood Ordinances
    • Mapping Needs Update Support System (MNUSS)
    • Community Assistance Visits (CAVs) and Community Assistance Contacts (CACs)
    • GIS Data
    • Base Map Data
    • Topographic Data
    • Hydrography Data
    • Community GIS Contact Information
    • Community Meetings and Contacts
    • Scope and Prioritization of Mapping Needs in Lincoln County
      • Prioritization of Towns in Lincoln County
      • Prioritization of Waterbodies in Lincoln County
    • Project Time and Costs for Identified Mapping Needs
    • Project Alternatives
  • Section 3. Options for Future Mapping and DTM Preparation
    • Mapping Requirements
    • Base Map
    • Digital Terrain Models (DTMs)
    • Flood-Insurance Risk Zones
  • Section 4. References Cited
  • Appendices
  • Appendix A: Community Contacts and Best Available Data: Lincoln County
  • Appendix B: Community Scoping Interview Data: Lincoln County
  • Appendix C: Existing MNUSS Data Entries: Lincoln County
  • Appendix D: Attachments
  • Appendix E: Census Block-Group Data
 

Tables

Table 1. Organized communities and unorganized territories in Lincoln County, Maine

Table 2. Summary of letters of map change (LOMCs) in Lincoln County, Maine

Table 3. Summary of entries in the Mapping Needs Update Support System (MNUSS) for Lincoln County, Maine

Table 4. Summary of Community Assistance Visits (CAVs) and Community Assistance Contacts (CACs) in Lincoln County, Maine

Table 5. Maine Department of Transportation mapped projects that intersect streams in Lincoln County identified as needing updated flood-insurance studies

Table 6. Maine Floodplain Management Program criteria for prioritization of community-based flood mapping needs in Lincoln County

Table 7. Maine Floodplain Management Program criteria for prioritization of community-based flood mapping needs in Lincoln County

Table 8. Maine Floodplain Management Program criteria and qualitative weight for prioritization of waterbody-based flood mapping needs in Lincoln County

Table 9. Prioritized waterbody-based flood mapping needs in Lincoln County requiring redelineation, limited detail study, or detail study

Table 10. Flood Insurance Rate Map (FIRM) Horizontal Accuracy

Table 11. National Standard for Spatial Data Accuracy (NSSDA)

 

Figures

Figure 1. Map showing communities in Lincoln County, Maine

Figure 2. Map showing hydrology of Lincoln County, Maine

Figure 3. Map showing orthophotography indices for Lincoln County, Maine. Indices indicate coverage of 1-foot (yellow; each image pixel representing a planimetric square 1 foot on a side), 2-foot (blue), and 1-meter (white) orthophotography archived and served through the internet by the Maine Office of Geographic Information Systems (MEGIS)

Figure 4. Map showing communities in Lincoln County identifying mapping needs by waterbody

Figure 5. Map showing proposed digital flood insurance rate map panels for Lincoln County

 

Contact

 

For questions or comments, please send inquiries to:
Robert Lent, Director
U.S. Geological Survey
Maine Water Science Center
196 Whitten Road
Augusta, Maine 04330

E-mail: dc_me@usgs.gov

For more information, visit our Web site at:
U.S. Geological Survey
Maine Water Science Center
http://me.water.usgs.gov/

 
 

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