Water Stewardship

Lower Mainland Dike and Emergency Maps

1. Lower Mainland Dike Inventory Maps
2. Emergency Planning Floodplain Maps (Lower Fraser River)

  1. Lower Mainland Dike Inventory Maps

The Lower Mainland Dike Inventory maps show the flood protection infrastructure regulated under the Dike Maintenance Act. The maps consist of a series of 37 individual map sheets covering the Lower Mainland Region (the lower Fraser River and tributaries, and the sea), the Squamish area (Squamish and Cheakamus Rivers), Whistler, and the Pemberton Valley (Lillooet River).

The maps contain information on:

• the dike infrastructure (such as dikes, pump stations, floodboxes, riprap, relief wells);
• known areas of hazard concerns (boil locations, low dikes, etc.);
• the major road/street network (to show access points onto the dikes); and
• other infrastructure relevant to safe operation of the dikes (such as major pipeline crossings, hydro lines, railway lines, etc.).

Compilation of the information came from various sources including TRIM, orthophotos, as-built drawings, O&M manuals, diking authorities, and historic records.

Please note that this revision (April, 2007) of the maps includes a new Fraser River flood profile for the Lower Fraser Valley. Details and background on this profile, and the study on which it is based, may be found at this location (see item 8).

Please note that the crest elevation of the dikes in the Lower Fraser River floodplain have not been evaluated against this new profile and may be lower than the elevation of this new profile plus freeboard.

The floodplain extent shown on the maps is based on old data and flooding may occur outside of the floodplain areas shown.

The maps are an important resource supporting a range of needs that include the Inspector of Dike’s regulatory responsibilities: flood emergency planning, preparedness, and response; broad-based floodplain management, planning and reviews; and other related activities.

The downloadable PDF file(s) of the maps available below may not display correctly with older versions of Adobe Reader. For best results it is recommended that the latest version of the Adobe Reader be used.

Lower Mainland Dike Inventory Maps (all in pdf format)

2. Emergency Planning Floodplain Maps (Lower Fraser River)

• Fraser Freshet Master Plan (3.1MB)
• Fraser Freshet Sector NE (2.4MB)
• Fraser Freshet Sector NW (4.5MB)
• Fraser Freshet Sector SE (2.9MB)
• Fraser Freshet Sector SW (3.6MB)

Contact Us: Water.Stewardship@gov.bc.ca

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