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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
Questions? Email us

Mapping and Technical Resources

FEMA Map Service Center

Find a Flood Insurance Rate Map (FIRM) Online
Find Digital FIRM Info, NFHL, Where Available
FEMA Flood Zones Defined

Converting Maps to Digital Format

Guidance Documents
Guidelines and Specifications for Flood Risk Analysis and Mapping

Changing / Correcting Maps

How to Request a Letter of Map Amendment (LOMA) or Letter of Map Revision Based on Fill (LOMR-F)
Letter of Map Amendment for Single Lot Only (LOMA): Use the MT-1 Form or MT-EZ Form
Letter of Map Revision Based on Fill (LOMR-F): Use the MT-1 Form
Letter of Map Revision (LOMR): Use the MT-2 Form
Letter of Map Amendment-Out As Shown Method (LOMA-OAS): Follow these instructions
FEMA's Technical Guidance for MT-1 determinations: MT-1 Technical Guidance  


Elevation Certificates

Elevation Certificate
Elevation Certificate: Converting NGVD1929 to NAVD1988
EC Made EZ Online 2013 Course
Elevation Certificates, 2013 Presentation to Surveyors
Surveyors Guide to ECs: NFIP Video and Resources


Engineering and Technical Resources

Unmapped Areas or Approximate Zone A Areas

Guidelines for Water Course Surveys in Undesignated or FEMA Zone A Floodplains
Floodproofing Certificate

Elevation Inventory Including LiDAR

U.S. NOAA Site
Montana Only ArcGIS View from MT NRIS
Openings in Foundation Walls - FEMA Publication
Floodway Encroachment “No-Rise Analysis”


So You Live Behind a Levee


Common Floodplain Acronyms


Mapping Resources and Related Links


Federal Emergency Management Agency (FEMA)
FEMA Map Service Center (FEMA)
Environmental Protection Agency (EPA)
National Aeronautics and Space Administration (NASA)
National Oceanic and Atmospheric Administration (NOAA)
U.S. Army Corps of Engineers (USACE)
U.S. Department of Agriculture (USDA)
U.S. Geological Survey (USGS)


Association of Montana Floodplain Managers (AMFM)
Montana Association of Counties (MACo)
Montana Association of Conservation Districts (MACD)
Montana Natural Resource Information System (NRIS)
Montana Department of Environmental Quality (DEQ)
Montana Watershed Coordination Council (MWCC)
Montana Disaster and Emergency Services (DES)
Montana Department of Transportation (MDT)

Other Organizations and Agencies

Association of State Floodplain Managers (ASFPM)
American Society of Photogrammetry and Remote Sensing (ASPRS)
Environmental Systems Research Institute (ESRI)


Bureau Chief
Water Operations Bureau
(406) 444-6816

Administrative Support
(406) 444-0862

NFIP/CAP Coordinator
(406) 444-6654

Tiffany Lyden, CFM
Outreach Specialist
(406) 444-0599

Floodplain Specialist
(406) 444-1343 

Civil Engineering Specialist
(406) 444-1300

Outreach Specialist
(406) 444-6732

Flood Hazard GIS Specialist
(406) 444-6664

Floodplain Mapping Specialist
(406) 444-6656