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The Rideau Canal in Ottawa

Landmark North America

Rideau Canal

The Rideau Canal is a long waterway in Canada. Boats ride up and down water steps called locks!

The Rideau Canal runs 202 kilometers from Ottawa to Kingston on Lake Ontario, in Canada. It was opened in 1832. Dams raised the rivers so boats could travel, and locks lift boats from one level to the next. Most lock gates are still opened by hand-turned winches.

The Rideau Canal, opened in 1832, links Ottawa with Kingston on Lake Ontario along 202 km of the Rideau and Cataraqui rivers. UNESCO calls it the best-preserved slackwater canal in North America and the only canal from the great early 19th-century canal-building era there that still operates along its original line with most of its structures intact. It was inscribed as a World Heritage Site in 2007.

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Photo: Bobak Ha'Eri, CC BY-SA 2.5, via Wikimedia Commons

Discover the Rideau Canal

The Rideau Canal is in Canada. It is a long path of water for boats.

It goes from the city of Ottawa to a lake called Lake Ontario.

The Rideau Canal is a waterway in Canada. It runs 202 kilometers from Ottawa, the capital, south to Kingston on Lake Ontario, following the Rideau and Cataraqui rivers.

Today, Parks Canada says, pleasure boaters and paddlers fill its locks, and other visitors come to watch the historic locks at work.

The Rideau Canal covers 202 km of the Rideau and Cataraqui rivers, from Ottawa south to the harbor of Kingston on Lake Ontario. UNESCO describes it as a monumental early 19th-century construction, one of the first canals to be designed specifically for steam-powered vessels.

UNESCO calls it the best-preserved example of a slackwater canal in North America, and the only canal from the great North American canal-building era of the early 19th century that remains operational along its original line with most of its structures intact.

Where
Ottawa to Kingston, Canada
Opened
1832
Length
202 km
World Heritage Site
2007
The Rideau Canal in Ottawa
Photo: Bobak Ha'Eri, CC BY-SA 2.5, via Wikimedia Commons

Built by John By

Long ago, a man named John By was put in charge of building the canal.

Thousands of workers dug, carried stones and built locks and dams. The canal opened in 1832.

In 1826 the British government chose Lieutenant Colonel John By of the Royal Engineers to build the canal. Parks Canada says it gave a safe supply route from Montreal to Kingston, an alternative to the St. Lawrence River.

Around 6,000 workers took part. Many came from French-Canadian settlements, and others were newly arrived immigrants, mostly from Ireland. The canal opened in the summer of 1832.

UNESCO records that the canal was built primarily for strategic military purposes, at a time when Great Britain and the United States vied for control of the region. Lieutenant Colonel John By of the Royal Engineers was appointed in 1826; his headquarters near the mouth of the Rideau River grew into Bytown, renamed Ottawa in 1855 (ICOMOS).

Parks Canada dates the start of work on the rivers to 1827; ICOMOS gives 1828. About 6,000 workers labored at many sites. They dug lock pits, hauled stone quarried on site and built the dams and locks, while local blacksmiths forged the iron fixtures. Parks Canada notes that workers who died of malaria, caught in the swamps along the route, always had to be replaced. The canal opened in 1832.

Through the years

Steps of water

The canal uses dams to make the rivers deeper.

Locks work like steps. A boat goes in, the water goes up or down, and the boat moves on.

John By did not dig a whole new channel. Instead, dams held back the rivers so the water became deep enough for boats. This is called a slackwater canal.

The water now sits at different levels, like steps. A lock is a walled chamber with gates where a boat is lifted or lowered from one level to the next. Parks Canada says By and his workers created 47 locks.

ICOMOS explains By's slackwater solution: instead of excavating long new channels, dams raised the river water into a series of navigable steps, with boats lifted from one to the next through locks. ICOMOS records 74 dams, and notes that By chose fewer locks with high lifts, up to 4.6 meters.

By persuaded his superiors to build locks at least 134 feet long and 33 feet wide, large enough for the new steamboats (Parks Canada). At Jones Falls, the stone arch dam spanned 107 meters and stood 19 meters high, which ICOMOS calls double the height of any previous dam in North America.

Eight locks at Ottawa

In Ottawa, eight locks sit one after another, like a staircase.

Most gates are still opened by people turning handles.

The Ottawa Locks are the northern entrance to the canal. Eight locks sit in a row, like a staircase, and together they lift boats 24.1 meters.

UNESCO says most of the canal's lock gates and sluice valves are still worked by hand-powered winches. The limestone for the Ottawa Locks came from the cliffs beside the works.

Parks Canada's history of the Ottawa lockstation: in September 1826 By chose a natural ravine as the canal's northern gateway. The first plan was two sets of four locks with a turning basin between them, but when the lock size was increased in June 1828 there was no room, so the eight locks were built as a continuous staircase with a total lift of 24.1 m. Loose sand and water from underground springs made the work hard.

ICOMOS notes that all the locks were hand-operated when the canal opened; by 2007, three had been converted to hydraulic or electric systems.

Ottawa Locks
8 locks in a flight
Ottawa total lift
24.1 m
Lockstations
22
UNESCO criteria
(i)(iv)
The Rideau Canal in Ottawa
Photo: Bobak Ha'Eri, CC BY-SA 2.5, via Wikimedia Commons

A working canal

In this photo, the locks step down to a wide river.

Green grass and buildings line both sides.

This photo was taken in August 2004. It looks down the Ottawa Locks toward the river, with a stone lockstation building on the left and a hotel on the right.

The canal has worked as a waterway without stopping since it was built. Each year, UNESCO says, engineers inspect one third of the canal's parts.

The photograph (August 2004, by Bobak Ha'Eri) looks down the flight of Ottawa Locks between the Ottawa lockstation (left, as a later Commons caption labels it) and a hotel (right), toward the Ottawa River and a bridge in the distance. Black hand winches stand beside the gates.

UNESCO reports that the canal has fulfilled its original function as an operating waterway without interruption since its construction. Repairs to the locks, dams, canal walls and banks are carried out under Parks Canada's control, and engineers thoroughly inspect one third of the canal's assets each year. The historic site closes to the public from mid-October to mid-May (Parks Canada).

The Rideau Canal in Ottawa
Photo: Bobak Ha'Eri, CC BY-SA 2.5, via Wikimedia Commons

Amazing facts

  • People still open many of the lock gates by turning handles!

    Most of the canal's lock gates and sluice valves are still worked by hand-powered winches, UNESCO says.

    UNESCO notes that most of the Rideau's lock gates and sluice valves are still operated by hand-powered winches; ICOMOS recorded in 2007 that three locks had been converted to hydraulic or electric operation.

  • The city of Ottawa began where the canal's builder set up his base!

    John By set up his headquarters near the mouth of the Rideau River. The settlement there was called Bytown, and it was later renamed Ottawa.

    Parks Canada records that By's 1826 headquarters near the mouth of the Rideau River was the origin of Bytown, the settlement later renamed Ottawa.

  • First the canal was a safe supply route, then it carried goods, and now people take fun boat trips on it!

    Parks Canada describes three eras on the canal: a military period, a commercial period carrying goods like timber and iron ore, and a recreational period that began in the 1880s.

    Parks Canada divides the canal's history into three eras: military, commercial (timber, potash, mica, feldspar, iron ore and phosphate by steamer and barge) and, from the 1880s, recreational, with excursion steamers carrying sightseers.

Words to know

canal
a waterway made or changed by people so boats can travel
lock
a section of a canal with gates where the water level is raised or lowered to move boats
dam
a wall built across a river to hold back water
slackwater canal
a canal made by damming rivers so their water becomes deep and calm enough for boats
winch
a machine with a handle that is turned to pull or move something heavy
lift
how far a lock raises or lowers a boat

Discovery challenge

  1. In which country is the Rideau Canal?

    The Rideau Canal runs from Ottawa to Kingston, in which country?

    The Rideau Canal links Ottawa with Lake Ontario in which country?

    • Canada
    • Chile
    • Kenya
    Show the answer

    Canada

    Canada!

    Canada.

    Canada.

  2. How long is the Rideau Canal?

    How long is the Rideau Canal, from Ottawa to Kingston?

    What length does UNESCO give for the Rideau Canal?

    • 202 kilometers
    • 20 kilometers
    • 2,020 kilometers
    Show the answer

    202 kilometers

    202 kilometers!

    202 kilometers.

    202 km.

  3. How many locks sit in a row at Ottawa?

    How many locks form the staircase of the Ottawa Locks?

    How many locks make up the flight at the Ottawa lockstation?

    • 8
    • 2
    • 80
    Show the answer

    8

    Eight!

    Eight locks.

    Eight locks, with a total lift of 24.1 m.

  4. How are most of the lock gates opened?

    What still works most of the canal's lock gates, UNESCO says?

    According to UNESCO, how are most of the Rideau's lock gates and sluice valves still operated?

    • By hand-turned winches
    • By steam engines
    • By wind sails
    Show the answer

    By hand-turned winches

    People turn handles on winches!

    By hand-powered winches.

    By hand-powered winches.

  5. When did the Rideau Canal become a World Heritage Site?

    In which year did UNESCO list the Rideau Canal?

    In which year was the Rideau Canal inscribed on the World Heritage List?

    • 2007
    • 1832
    • 1907
    Show the answer

    2007

    2007!

    2007.

    2007.

Nearby places

Explore next

For parents & teachers

What children will learn

  • Explain how a lock raises or lowers a boat.
  • Describe how dams can turn a river into a waterway for boats.
  • Explain how a canal's use can change over time.

Recommended ages: 4 to 17 · About 15 minutes

Talk about it

  • Why would builders choose dams instead of digging a new channel?
  • Why might people keep turning lock gates by hand today?
  • How did building a canal help a city like Ottawa grow?

Try at home or in class

  • Make a model lock with two plastic boxes and a toy boat: pour water in to raise the boat to the next level.
  • Trace the route from Ottawa to Kingston on a map of Ontario and find Lake Ontario.

Key vocabulary: canal, lock, dam, slackwater canal, winch, lift

Where these facts come from

  1. Wikidata , Wikimedia Foundation (CC0 1.0)
  2. Rideau Canal , UNESCO World Heritage Centre
  3. Advisory Body Evaluation: Rideau Canal, No 1221 , ICOMOS / UNESCO World Heritage Centre
  4. Rideau Canal National Historic Site: Culture and history , Parks Canada
  5. History of Ottawa lockstation , Parks Canada
  6. Rideau Canal National Historic Site , Parks Canada
  7. File:Rideau Canal.jpg , Wikimedia Commons
  8. UNESCO World Heritage List , UNESCO World Heritage Centre (Linked as a reference; site facts come from Wikidata)
  9. Wikimedia Commons , Wikimedia Foundation (Per file (public domain, CC0, CC BY or CC BY-SA); see each media record)

Checked, not yet human-reviewed. Last updated November 1, 2026. Spotted a mistake? Tell us.

Picture credits
  • Photo: Bobak Ha'Eri, CC BY-SA 2.5, via Wikimedia Commons · source · license