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Resources & Events

In the years leading up to the release of IGLD (2020), the Coordinating Committee will conduct extensive outreach to share the update with stakeholders. To facilitate this outreach, downloadable resources are being developed and will be uploaded to this website for free, public access. We invite you to share these materials within your network! 

The Coordinating Committee will also host a series of IGLD (2020) outreach events, from summits to webinars, and participate in conferences. Please visit our Presentations and/or Webinars sections below to find out where we’ll speak next, watch recorded events, and learn more about our work!


  1. Title: Bi-Nationally Coordinated Water Levels: Charting the way for a new International Great Lakes Datum | Presenters: Sierra Davis (NOAA), Khaleel Arfeen (CHS) | Venue: 2022 Canadian Hydrographic Conference | Dates: June 6-9, 2022
  2. Title: International Great Lakes Datum: Possible Impacts and What you Need to Know | Presenters: Terese Herron (CHS), Laura Rear McLaughlin (NOAA) | Venue: 2022 Canadian Hydrographic Conference Dates: June 6-9, 2022


  1. Title: The International Great Lakes Datum: Foundational Infrastructure for Monitoring Water Levels | Presenter: Jacob Heck (NOAA), Jeff Jalbrzikowski (NOAA) | Venue: IAGLR State of Lake Erie Conference | Date: March 17, 2022
  2. Title: Updating the International Great Lakes Datum and Low Water Datum | Presenters: John Allis (USACE), Derek Cusimano (USACE) | Venue: 2022 Post Construction Conference | Date: February 2, 2022


  1. Title: Updating Low Water Datum in the Great Lakes | Presenter: Chris Zervas (NOAA) | Venue: Lakebed 2030 Conference: Let’s Dive In! | Date: September 30, 2021
  2. Title: An Updated International Great Lakes Datum (IGLD): What Does This Mean for Your Field of Practice and Local Community? | Presenter: Nicole Kruz (NOAA – Affiliate) | Venue: Lakebed 2030 Conference: Let’s Dive In! | Date: September 29, 2021
  3. Title: Updating Low Water Datum | Presenter: Chris Zervas (NOAA) | Venue: 2021 US Hydro Virtual Conference | Dates: September 13-16, 2021
  4. Title: Advances in Computational Methods to Deliver the International Great Lakes Datum (2020) Update: Seasonal and Permanent Gauging | Presenters: Sierra Davis (NOAA), Khaleel Arfeen (CHS) | Venue: 2021 US Hydro Virtual Conference | Dates: September 13-16, 2021
  5. Title: Lake Surface Topography from Water Gauging, GNSS Observations and Gravimetric Geopotential Models | Presenters: Dan Roman (NOAA), Marc Véronneau (CGS), John Crowley (NRCAN) | Venue: 64th IAGLR 2021 | Dates: May 17-21, 2021
  6. Title: Updating the International Great Lakes Datum: Enabling the Integration of Water and Land Management in the Great Lakes Region | Presenters: Jacob Heck (NOAA), Dr. Michael Craymer (CGS) | Venue: FIG Working Week 2021 | Dates: June 21-25, 2021


  1. Title: Unknown – included content on Low Water Datum and IGLD (2020) | Presenters: Charles Wisotzkey (NOAA) | Venue: Marine Technology Society Great Lakes Tech Surge | Dates: September 30 – October 2, 2020


IGLD 2020 Factsheet

Download File

A Low Water Datum Factsheet is under development



None currently scheduled

  1. Title: IGLD (2020) Update | Presenters: Laura Rear McLaughlin (NOAA), Nicole Kruz (NOAA – Affiliate) | Venue: NOAA’s Great Lakes Regional Collaboration Team Meeting | Date: November 19, 2021
  2. Title: Vertical Datums: An Overview & Planned Updates | Presenter: Laura Rear McLaughlin (NOAA) | Date: July 15, 2021 from  2:00-3:00 pm ET | View event recording

Media Mentions

  1. Publisher: Great Lakes Seaway Review by Harbor House Publishers (Volume 50, Number 2) | Article Title: New Water Standards: Updating International Great Lakes Datum to Reflect Lake Bottom Rebound | Publication Date: October – December 2021 | Read here
  2. Publisher: Duluth Seaway Port Authority – North Start Port (Volume 54, Number 2) | Article Title: NOAA [and Partners] updating system used to measure Great Lakes water levels | Publication Date: Spring 2021 | Read here
  3. Publisher: Shipwatcher News, #55 (January – February 2021 Edition) | Article Title: Building the International Great Lakes Datum | Publication Date: March 2021 | Read here
  4. Publisher: LEVEL News (Volume 29, Number 2) | Article Title: Great Lakes and St. Lawrence River Water Levels – IGLD 1985 Update | Publication Date: February 2021 | Read here
  5. Broadcaster: Interlochen Public Radio | Podcast Title: Points North: Rising Water | Release Date: October 1, 2020 | Listen here
  6. Publisher: FreightWaves | Article Title: On the Level: How NOAA Water Data Updates Help Maritime Shippers | Publication Date: September 23, 2020 | Read here
  7. Publisher: The Waterways Journal Weekly | Article Title: GLDT Annual Meeting Addresses Important Datum Changes and Water Level Predictions | Publication Date: June 8, 2020 | Read here

Newsletter Entries

  1. Publisher: NOAA’s Office of Coast Survey, quarterly Navigation Services Newsletter | Article Title: Datum Updates Will Improve Water Level Measurements in the Great Lakes and Along US Coastlines | Publication Date: October 15, 2020
  2. Publisher: USACE Survey & Mapping Community of Practice Newsletter | Article Title: IGLD (2020) Update | Publication Date: April 2021

Infographics & Videos


An IGLD (2020) video is currently planned for 2023


IGLD (2020) infographics are currently under development

Technical Reports

None at this time – a Low Water Datum Technical Report is planned