Water Level Data:
- Environment Canada
- Great Lakes Information Network (GLIN)
- National Oceanic and Atmospheric Administration (NOAA)
- The Canadian Hydrographic Service
- Unites States Army Corps of Engineers (USACE)
- Water Survey of Canada
Great Lakes - General Information:
- Great Lakes Commission
- Great Lakes Dredging Team
- Great Lakes Environmental Research Laboratory (NOAA)
- Great Lakes Information Network (GLIN)
- Great Lakes Science Center (USGS)
- Great Lakes Science Center - Museum
- Great Lakes United
- International Association for Great Lakes Research
- Lake Michigan Forum
- National Oceanographic and Atmospheric Administration
PIAG Organizations:
- City of Superior
- Conservation Ontario
- Ducks Unlimited
- Georgian Bay Association
- Grand Valley State University
- Great Lakes Sport Fishing Council
- Great Lakes United
- International Great Lakes Coalition
- International Sailing Federation
- Lake Carriers' Association
- Lake Superior Conservancy and Watershed Council
- Lakehead Shipping Company Ltd.
- Ohio DNR
- Sault Ste. Marie Tribe of Chippewa Indians
- Save Our Shoreline
Canadian Government:
- Canadian Coast Guard
- Environment Canada
- Government of Ontario
- Ministry of the Environment
- Ministry of Natural Resources
- Natural Resources Canada
US Government:
- Great Lakes Environmental Research Laboratory (NOAA)
- Great Lakes Science Center
- Indiana Department of Natural Resources
- Michigan Section - American Water Resources Association
- State of Illinois
- State of Indiana
- State of Michigan
- State of Wisconsin
- US Army Corps of Engineers, Detroit District
- US Army Corps of Engineers, St. Paul District
- US Environmental Protection Agency
- US Geological Survey Water Resources of the United States (USGS)
- US Geological Survey Water Resources of Illinois
- US Geological Survey Water Resources of Indiana
- US Geological Survey Water Resources of Michigan
- US Geological Survey Water Resources of Wisconsin
- Wisconsin Department of Natural Resources