YARD DRAINAGE • BISMARCK, ND
Yard Drainage and Grading in Bismarck, ND
Bismarck Landscape fixes yard drainage problems for homes in Bismarck, Mandan and Lincoln: soggy lawns, standing water, wet basements, icy sidewalks from downspouts and spring melt that heads straight for the foundation.
The first fix is usually the simplest one: get the ground around your house sloping away from it and get roof water out past that slope. Building code calls for the ground to drop at least 6 inches in the first 10 feet from the foundation. A lot of drainage problems in town come down to that one rule being broken.
PROBLEM SIGNS • WATER • SOIL • SPRING MELT
Signs Your Yard Has a Drainage Problem
- Water stands on the lawn for a day or more after rain
- Spring melt pools against the house or in the same low spot every year
- The basement gets damp or the sump pump runs constantly in spring
- Soil has sunk next to the foundation, so the ground slopes toward the house
- Downspouts dump onto the driveway or sidewalk and freeze into an ice sheet
- Grass is yellow or thin in the same wet areas
LOCAL CONDITIONS • CLAY • FROST • FOUNDATION
Why Bismarck Yards Hold Water
- Heavy clay. NDSU Extension notes clay soil drains slowly. Water that would soak into sandy soil sits on top of ours.
- Frozen ground in spring. Bismarck averages about 50.5 inches of snow a year. When it melts, the ground below is often still frozen, so the water can’t soak in at all. It runs wherever the surface sends it.
- Settled soil around foundations. The dirt backfilled around a basement can settle over the years, and a slope that once ran away from the house ends up running toward it.
- Flat lots. Some lots are graded fairly flat, which leaves little room for error.
- Downspouts in the wrong place, dumping right next to the foundation or onto concrete.
START SIMPLE • CHOOSE THE RIGHT SOLUTION
Drainage Fixes, From Simplest to Biggest
We start with the simplest fix that works. A lot of yards that seem to need a French drain really need a regrade and a couple of downspout extensions.
Regrading Around the Foundation
The 2021 International Residential Code, which North Dakota’s state building code adopts, requires lots to be graded so surface water drains away from foundation walls, with the ground dropping at least 6 inches within the first 10 feet. Where there isn’t room for that, the code calls for a slope of at least 5% and drains or swales to move the water away.
Regrading means adding and packing soil along the house so it slopes away, then reseeding or re-sodding. For new grass afterward, see sod installation in Bismarck.
Downspout Extensions and Buried Lines
Roof water is the biggest single source of water near most foundations. The fix is to carry it past the slope and let it out where it can spread.
The City of Bismarck asks homeowners to send gutter water away from hard surfaces like driveways and sidewalks and into lawns or planted areas, so it has a chance to soak into the soil. That also saves you a winter headache. Water dumped on the sidewalk freezes, and the city’s sidewalk rule makes you responsible for clearing snow and ice there. See Bismarck snow rules for homeowners.
Swales
A swale is a wide, gently dipped grass channel that carries water across the yard to where it can go. It’s often the cheapest way to move water between houses or around a patio. Where a swale runs within 10 feet of the house, the building code calls for it to slope at least 2%.
French Drains and Curtain Drains
A French drain, sometimes called a curtain drain, is a gravel-filled trench with a perforated pipe that catches water underground and carries it away. It works best for groundwater and seepage moving downhill toward a house or across a yard.
On clay, the trench and pipe have to lead somewhere lower. A French drain that ends in more clay just fills up. Every drain we build has a planned outlet.
Catch Basins and Channel Drains
A catch basin is a box in a low spot that collects surface water. A channel drain is a grated trench set into concrete or pavers, often across a driveway or along a patio. Both need a pipe with a real outlet.
Dry Wells and Rain Gardens on Clay
A dry well is an underground chamber that holds water while it soaks into the ground. A rain garden is a planted low spot that does the same thing at the surface. Both work on sandy soil. On Bismarck clay, they only work if the soil around them can actually absorb water, so we test how fast your soil drains before recommending either one.
CITY GUIDANCE • SUMP DISCHARGE
Sump Pump Water: What the City of Bismarck Asks
Sump pumps move a lot of water in a Bismarck spring. The City of Bismarck’s stormwater page says:
- Warm weather: “When possible, warm weather sump discharge should go to a non-erodible surface such as the driveway, street, or directly to a storm drain.”
- Not the lawn, in many cases: “It isn’t always a good idea to run your sump discharge onto a lawn or any pervious surface,” because “the water could end up being recycled into your neighbors or your own sump system.”
- Winter: “Wintertime sump discharge should go into the sanitary system via a floor drain or tub.”
The city also notes that storm drain water isn’t treated and “flows directly to the Missouri River,” so only stormwater belongs in it. For questions, contact Bismarck Public Works Utility Operations, option 4.
OUR PROCESS • FIND THE OUTLET FIRST
How We Fix a Drainage Problem
- Look at it when it’s wet, during or right after rain or snowmelt, if we can.
- Check the grade. We measure the slope along the foundation and across the yard with a level.
- Find the outlet first. Every fix needs a lower place for the water to go that won’t send it onto a neighbor’s lot or the sidewalk.
- Call 811. North Dakota law requires anyone digging, homeowners included, to call at least 48 hours ahead. Line marking costs you nothing.
- Do the simplest fix that works: grade, downspouts and swales first, then underground drains only if needed.
- Test it with a hose before we backfill and seed.
- Restore the lawn or beds.
COST PLANNING • NATIONAL ESTIMATES
How Much Does Yard Drainage Cost?
We couldn’t find a published Bismarck-specific drainage cost guide, so here are national figures:
| Fix | National estimate | Source |
|---|---|---|
| Downspout extension | About $5 to $25 each | HomeGuide, Feb 2026 |
| Swale | About $250 to $1,000 | HomeGuide, Feb 2026 |
| Yard regrading | About $500 to $3,000 | HomeGuide, Feb 2026 |
| Dry well | About $300 to $1,500 | HomeGuide, Feb 2026 |
| Channel or trench drain | About $30 to $150 per linear foot | HomeGuide, Feb 2026 |
| Exterior French drain | About $10 to $50 per linear foot, or $500 to $10,000 total | Angi, May 30, 2026 |
Sources: HomeGuide’s drainage system cost guide and Angi’s French drain cost guide. These are market estimates, not quotes. Price depends on how much soil moves, how far the water has to go and access. You get a written price after we see the site. For other local prices, see how much landscaping costs in Bismarck.
SEASONAL TIMING • SPRING TO FALL
When to Fix Drainage in Bismarck
- Spring melt shows the problem best. Take photos of where water sits.
- Late spring through fall is the time to fix it, once the ground has thawed and dried enough to dig and grade without making a mess of wet clay.
- Before the ground freezes in fall is the last good window, so next spring’s melt has somewhere to go.
- Before new sod, a patio or a wall. Drainage is cheapest to fix when the yard is already torn up. See paver patios in Bismarck and retaining walls in Bismarck.
SERVICE AREAS • LOCAL WATER CONDITIONS
Drainage Across Bismarck, Mandan and Lincoln
- South Bismarck (Fox Island, Southport, Riverwood): lower ground near the Missouri River, where spring water can leave silt on lawns and there’s less room for water to fall.
- North Bismarck and Lincoln new builds: fresh grading, settled backfill around basements and lots graded close to flat.
- Central Bismarck (Cathedral Area, Highland Acres, Washington Heights): older homes where decades of settling have flattened the slope along the foundation, and downspouts often empty right at the wall.
- Mandan: sloped lots where water from uphill needs a swale or drain to get around the house.
Soggy clay can also turn a lawn yellow. See our yellow lawn guide and our irrigation service.
Questions
Yard Drainage FAQ
Answers about foundation slopes, gutter outlets, sump pump discharge, clay-soil drains and typical costs.
Need help choosing the right fix?
Read our clay soil drainage guide for more details.
How much should my yard slope away from the house?
The 2021 International Residential Code, adopted through North Dakota’s state building code, says the ground should fall at least 6 inches within the first 10 feet from the foundation. Where there isn’t room, it calls for at least a 5% slope plus drains or swales to move water away.
Where should my downspouts drain in Bismarck?
Onto lawn or planting beds, away from the foundation. The City of Bismarck asks homeowners to send gutter water away from driveways and sidewalks and into lawns or planted areas so it can soak in. Water dumped on a sidewalk also freezes, and you’re responsible for clearing that ice.
Where should sump pump water go in Bismarck?
The City of Bismarck says warm-weather sump water should go to a hard surface like the driveway or street, or directly to a storm drain, since lawn discharge can cycle back into sump systems. In winter, the city says sump water should go into the sanitary system through a floor drain or tub.
Do French drains work in clay soil?
Yes, if the pipe has a lower outlet to carry the water away. In clay, a French drain that just ends in more clay fills up and stops working. The trench, gravel and perforated pipe have to lead somewhere water can actually go.
Why does water pool in my yard every spring?
Usually because the snow melts while the ground underneath is still frozen, so the water can’t soak in. Bismarck’s clay also drains slowly. If the low spot is near the house, regrading and extending downspouts are usually the first fixes.
How much does yard drainage work cost?
It depends on the fix. HomeGuide’s February 2026 national figures put downspout extensions at about $5 to $25 each, swales at about $250 to $1,000 and yard regrading at about $500 to $3,000. Angi puts exterior French drains at about $10 to $50 per linear foot. These are estimates, not quotes.
Bismarck Landscape
Get a Drainage Estimate in Bismarck
Got water where it shouldn’t be? Take a few photos the next time it rains or the snow melts. We’ll find where the water is coming from, where it can go and the simplest way to get it there.
You can also see our other contact options, landscape design in Bismarck or our FAQ.