Otto Holden Dam (La Cave)

It’s the Otto Holden Dam’s 70th anniversary this year. Take a look at our online photo exhibit featuring photos from our collection that show the development and building of the dam from 1948-1952.

Aerial View of Otto Holden

The Otto Holden Dam, also known as La Cave, was completed in 1952. Over 2.7 million tons of earth and rock were excavated during construction and it was built with 300,000 cubic meters of poured concrete.

As was the practice at the time, 23 houses were built in the nearby town of Mattawa for operating staff, and a 4.8-km highway was built for travel to the site.

It was originally named La Cave GS (and many still refer to it as this). However, the plant was renamed to honour Dr. Otto Holden, an accomplished engineer with Ontario Hydro who was instrumental in the expansion of hydroelectric power in the province.

Read more about the Otto Holden Dam.

Mattawa Museum to Hold Annual General Meeting on November 24th

We invite you to join us!

The annual general meeting (AGM) of the Mattawa Museum will be held on Thursday, November 24, 2022 at the Museum on 285 First Street beginning at 7pm.

It has been both an exciting and successful year for the Museum, with a significant number of visitors, an interesting and immensely popular traditional Indigenous canoe build on site during the summer, the realization of several funding grants, and the employment of an enthusiastic and youthful summer staff.

“We are very proud of all that has been accomplished this year,” says Judy Toupin, Curator of the Museum. “It was without a doubt one of our best years ever, and we want to build on that momentum.”

The AGM will highlight much of what has been achieved at the Museum during 2022 and will also present future opportunities and options that will allow for its continued growth and success.

“There are about two hundred email subscribers of the Mattawa Museum and almost 1,000 followers on our Museum Facebook page.” says Judy. “We want to continue to our wonderful momentum by having a membership drive.”

One of the specific areas of interest for us as a member of this community is supporting our local youth. We had one of the most amazing teams of young people this past summer and giving back is especially important to us. To that end, as part of your paid Membership to the Museum, a portion of funds collected will be given in the form of a scholarship/bursary to each high school in our community.

We see this as a win-win-win, so let’s continue to support our community. Together we can grow and enhance the museum and increase its visitation so that it becomes an integral part of the many attractions in the Mattawa area.

Snacks and refreshments will be served during the Museum’s AGM, so please register if you plan to attend so that organizers can ensure that quantities are adequate. We look forward to seeing you there. To register for the Mattawa Museum AGM, please contact us at: or 705-744-5495

Canoe-launch this summer. The traditional Canoe Build was a key
component of the Mattawa Museum’s 2022 Programs

Museum Membership

Why does membership matter?

It is a tangible reflection of support for your local community museum. Membership helps us with the cost of daily operations and contributes to the support of upcoming exhibits/displays.

$5 from every paid membership will be put towards a Scholarship/Bursary for each of our local high schools.

Membership for the year is from Nov 15, 2022 to Nov 15, 2023.

Membership TypeCostAdmissionsDiscounts
Individual$352 free individual admissions for the 2023 season10% discount in the Gift Shop
Family$452 free family admissions for the 2023 season10% discount in the Gift Shop
Mattawa Museum Annual Memberships

Remembrance Day and Veterans’ Week 2022

Service, Courage and Sacrifice. At home, around the world and across generations.

View this year’s Remembrance video

November 11th is a day to honour all who have fallen from all wars – recent and past. As well, we recognize all of Canada’s Veterans, serving and retired, and the families who have lost loved ones.

Let us remember our Local Veterans

Mattawa Women’s Institute & Mattawa Cenotaph

People of Mattawa

Check out our online photo exhibit featuring photos from our collection of various people from Mattawa and surrounding areas. Do you recognize anyone or have any information about the photos? Please leave a comment for us!

Ada (Smith) Montreuil

Escape Room Challenge – The Leaderboard

Congratulations to team Crocs and Socks for completing our escape room this season with the best time!

We had 58 people participate in teams this past summer and fall. We hope you all enjoyed it (it sounded like you did)!

Thank you to our summer team for creating such an awesome and unique experience. Maybe we will create a new escape room next season.

Stay tuned!