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

Mapping and Technical Resources

Montana DNRC has been a Cooperating Technical Partner (CTP) since 2005. Our CTP initiated the first Map Modernization projects in the state and since that time has cooperatively worked with FEMA to scope, plan, manage, and complete multiple Map Modernization and RiskMap projects.

Our program is continually working to expand our capabilities as a CTP. We see ourselves as an integral partner with FEMA in effectively delivering flood-risk information to local Montana communities and building local capacity to mitigate flood risk.

Montana DNRC updates our business plan annually to reflect the needs of the communities and the state. 

2020 Montana DNRC Floodplain Mapping Program Business Plan 

In collaboration with communities across the state the floodplain mapping program has prioritized the mapping projects for the next 5 years. This plan is a fluid document and can be subject to change if a community would like to have updated floodplain mapping. To request floodplain mapping in your county please contact Nadene Wadsworth, , (406) 444-6732; or Tiffany Lyden, , (406) 444-0599.  

FEMA Flood Insurance Rate Maps (FIRMs)

Viewing and Obtaining Flood Maps
FEMA Map Service Center

FEMA National Flood Hazard Layer (NFHL) Viewer (where Digital Maps are available)
FEMA Flood Zones Defined

FEMA Products and Tools

Floodplain Maps - Overview and Helpful Links
Flood Risk Mapping, Analysis and Planning (RiskMAP)

Revising Maps / Requesting Flood Zone Determinations

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-EZ Form or MT-1 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
Paper Application Forms for a Letter of Map Change (LOMC)
Online Letter of Map Change (LOMC) Application 
Online LOMC tutorial
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
Elevation Certificates, 2013 Presentation to Surveyors
Surveyors Guide to ECs: NFIP Video and Resources

Unmapped Areas or Approximate Zone A Areas

Guidelines for Water Course Surveys in Undesignated or FEMA Zone A Floodplains - Presentation

Engineering and Technical Resources

Floodway Encroachment “No-Rise Analysis" and LOMR Requirements - presentation 
Floodproofing Certificate
Flood Vents / Flood Openings (Wet Floodproofing) - FEMA Technical Bulletin 1
Flood Damage-Resistant Materials - FEMA Technical Bulletin 2
Non-Residential Floodproofing (Dry Floodproofing) - FEMA Technical Bulletin 3

Elevation Inventory / LiDAR

MT State Library - LiDAR inventory and requesting data 
DNRC - LiDAR information 
NOAA Interagency Elevation Inventory


So You Live Behind a Levee


Common Floodplain Acronyms


Agency/Organization 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