Grand Forks Concrete Repair Guide: Soils & Rules (2026)

Updated October 19, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Winter	About 48 inches of snow a year; January mean about 6°F	NOAA 1991–2020 normals (via Wikipedia)
Ground	Glacial Lake Agassiz lakebed; soft, expansive Brenna clays about 30 ft thick near Grand Forks	North Dakota Geological Survey
ND license	Required for jobs over $4,000; check on FirstStop	ND Secretary of State
MN license	Residential building contractor license; one-skill specialty contractors exempt; $15,000 receipts exemption with certificate	Minn. Stat. 326B.805, 326B.802
Grand Forks sidewalks	City list, owner notified and may repair first; otherwise specially assessed	City of Grand Forks staff reports, 2026
East Grand Forks sidewalks	New walks: 4 in. concrete on 4 in. gravel; 6 in. across driveways	East Grand Forks Ord. 313 (2010)

Why does concrete settle and heave here?

The Red River Valley is the floor of glacial Lake Agassiz. In a 2023 newsletter article, the North Dakota Geological Survey describes the Brenna Formation lake clays under the Fargo area as soft and expansive (smectitic), notes that they are slightly thinner around Grand Forks, about 30 feet, and warns that the overlying Sherack silts and clays can flow under load when saturated. Concrete laid on soft, wet clay or on loosely placed fill is the most likely to sink.

Weather piles on. Grand Forks International Airport's 1991–2020 normals show about 48 inches of snow a year and a January daily mean near 6°F. Water that gets under a slab freezes and lifts it, then leaves gaps as it thaws. On flat valley ground, spring melt often has nowhere to go but into the soil next to driveways and stoops.

How does the Grand Forks sidewalk program work?

The city's 2026 staff reports for Project 9004 (City Sidewalks) lay out the process. The Engineering Department adds sidewalks it identifies as needing repair to a list, which the City Council approves. Owners of adjoining properties are then notified and given the opportunity to repair the sidewalk themselves. Repairs not done by the owner are completed under the city's contract and specially assessed to the property, and repairs requested by citizens are assessed to the owner individually. Sidewalk work required because of a new ADA curb ramp is paid under the separate ramp project and isn't assessed to the adjoining owner. The reports don't describe permit rules, so ask the city what your contractor needs before working in the right-of-way.

What about East Grand Forks?

East Grand Forks has its own code. Ordinance 313 (2010), on sidewalks in new subdivisions, requires at least four inches of concrete on a four-inch gravel base, six inches where a sidewalk crosses a driveway, a level path at least five feet wide across driveways, and a slope toward the street. For repairs to existing sidewalks or approaches, contact the city.

How are contractors licensed on each side of the river?

North Dakota. The Secretary of State requires a contractor license whenever the cost of a job exceeds $4,000. Licenses come in classes A through D based on contract size. Check a license on the FirstStop contractor search.

Minnesota. Minnesota licenses residential building contractors through the Department of Labor and Industry. Under Minn. Stat. 326B.805, specialty contractors who provide only one special skill are exempt, and "masonry and concrete," which includes slabs, is one of those skills under 326B.802. A person whose specialty-skill receipts don't exceed $15,000 a year can also be exempt with a certificate of exemption. So a concrete-only contractor may legitimately have no Minnesota residential license. Ask what they hold, and check it with the department.

Lift or replace?

Lift when the slab is still in one or two solid pieces and has settled or tipped. Replace when it's broken into many pieces, badly scaled, or failing for a reason lifting won't solve. Either way, deal with the water: extend downspouts, send sump discharge away from slabs, and seal joints, especially the one against the house.

Questions to ask a contractor

Slurry or foam, and why for this slab on this soil?
How many holes, and how will they be patched?
What made it sink, and what will keep it from happening again?
Which state license or exemption do you hold?
Will you get any permit the city requires, and what does your warranty cover?

Common questions

Can I hire my own contractor for a Grand Forks sidewalk on the city's list?

Yes. The city's 2026 reports say owners are notified and given the opportunity to repair the sidewalk themselves before the work is done under the city project and specially assessed.

Does a concrete contractor need a license in North Dakota?

Yes, for jobs over $4,000. Look the contractor up on the Secretary of State's FirstStop search.

Does a concrete contractor need a license in Minnesota?

Not always. Minnesota exempts specialty contractors who provide only one special skill, and masonry and concrete is one of them. Ask what the contractor holds and verify it with the Department of Labor and Industry.

Grand Forks concrete repair guide (2026)