Survey markers: the hidden dots that map Alberta
Brass discs in sidewalks, metal caps in ditches, iron pins at the corners of yards. They’re survey markers, and they hold the whole map of Alberta together. Here’s what they are and how to find them.
What is a survey marker?
Look down while you walk, and you may spot a small brass disc set in a sidewalk, a metal cap on a post sticking out of a ditch, or an iron pin poking out of the grass at the corner of a yard. These are survey markers (surveyors call them monuments). Each one marks an exact spot on Earth, measured very carefully by land surveyors.
Some are easy to see. Many are hidden: buried just under the soil, covered by grass, or tucked under snow. Surveyors use metal detectors to find them!
The three kinds you might find
📏 Property corners
Iron posts or pins that mark the corners of a piece of land, like your yard or a farmer’s field. In Alberta, only a licensed Alberta Land Surveyor can place them. They decide where one property ends and the next begins.
📍 Alberta Survey Control Markers
Tens of thousands of these are spread across the province. Each is usually a 2.5-metre steel post driven deep into the ground, with a brass tablet on top stamped with its own number. The province knows the exact position and height of every one, and surveyors measure everything else from them.
⛰ Benchmarks
Brass discs set in bedrock, bridges or old buildings, marking an exact height above sea level. Some across Canada are over 100 years old, and many are stamped “Geodetic Survey of Canada”.
Why our roads are a giant checkerboard
Fly over southern Alberta and the land looks like graph paper. That’s thanks to the Dominion Land Survey, which began measuring the Prairies in 1871 so settlers could claim land.
- The land was divided into townships, squares about 6 miles (almost 10 km) on each side.
- Each township holds 36 sections, each one mile square, or 640 acres.
- Each section splits into four quarter sections of 160 acres. A quarter section was the size of a settler’s homestead.
- Strips of land called road allowances, 66 feet wide (one surveyor’s chain), were left between sections. That’s why so many country roads here run exactly a mile apart!
Look, but never touch
Survey markers are important public property. Under Alberta’s Surveys Act, it’s against the law to remove, move or destroy one. A missing marker can cause property disputes and cost a lot to replace.
- Never dig up, pull out, bend or move a marker.
- Don’t stand fence posts, signs or sheds on top of one.
- If you see one that’s damaged, tell an adult. They can let the local municipality or the province’s Geodetic Control Unit know.
✏ Try it yourself: become a marker hunter
- Go on a marker hunt with an adult. Check sidewalks near old buildings, bridges, parks, and the corners of streets. Look for a small round brass disc or a metal cap.
- Read the stamp. Most have words, a number, and sometimes an arrow or a small cross. Write them down and take a photo. Don’t clean it with anything rough.
- Find your own land description. Ask a parent to help you find your home’s section, township and range on a county or municipal map. Can you work out which quarter section it’s in?
- Pace a section: on a country road with an adult, use the car’s odometer to drive from one crossroad to the next. Is it about 1.6 km (one mile)?
Like treasure hunting? Try geocaching, and learn to use a compass in Compass and orienteering.
❓ Quick quiz
Guess first, then tap to see the answer.
What is a survey marker?
A metal post, pin or brass disc that marks an exact, carefully measured spot on Earth.
How many sections are in a township?
36.
How big is a quarter section?
160 acres, the size of a settler’s homestead.
What does “W4M” mean?
West of the Fourth Meridian, the line at 110 degrees west that forms the Alberta-Saskatchewan border.
You find a survey marker. What should you do?
Look, photograph it and write down the number, but never move or damage it.
🏫 For teachers and parents
- Ages: 8 to 14; links to mapping in social studies, Alberta settlement history, and measurement in math.
- Area math: 640 acres in a section, 160 in a quarter; how many football fields is a quarter section? (About 120.)
- Local history: pair with homestead stories from students’ own families, and with the Galt Museum.
- Citizenship: why protecting public markers matters to everyone who owns land.
- More ideas in the Teachers’ Corner.
More Earth Explorers
Sources: Government of Alberta, Geodetic Control Unit and the Surveys Act; Alberta Land Survey History, The Dominion Land Survey System.