Brighton, Colorado: what the ground under the city is like
Brighton sits in Adams County, on front range: pierre shale and denver formation. The soil mapped here is predominantly classified well drained — and that classification, not the rainfall total, is what decides how a basement behaves.
18% of the mapped soil area around Brighton is wet enough that the USDA describes it as needing artificial drainage.
Linear extensibility 13.4% — very high.
Shallowest annual water table around 190 cm (6.2 ft).
Values are for Adams County, which is what the soil survey resolves to. Full county report · soil map for a specific address.
The ground under Brighton
Front Range: Pierre Shale and Denver Formation. Weathered bentonitic shale rich in smectite, with dipping beds
The best-known expansive soil region in the United States. The risk is not a wet basement — rainfall is low and the water table deep. The risk is heave: wetted bentonitic clay lifts slabs and load-bearing walls. That is why local practice uses void forms under grade beams and drilled piers.
When it shows up here
| Water | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ground movement | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
The mechanism here is the wet–dry cycle, and it peaks in the summer drought: clay shrinks hard from June to September, then the first heavy rain swells it back. Foundation cracks tend to appear at the ends of that swing, not during it.
Climate pattern for this physiographic region, not a forecast for your house and not from the soil survey. It answers a question homeowners actually ask: when does this show up.
What repairs cost in Colorado
| Reference job | Modelled range |
|---|---|
| Interior drain along two walls + sump pump | $5,550–$11,950 |
| Exterior excavation of one 40 ft wall | $4,200–$11,900 |
| Underpinning on 10 piers | $16,500–$35,200 |
Regional factor for CO: ×1.10. Full cost breakdown for Colorado · run your own dimensions.
ZIP codes in Brighton
80601, 80602, 80603
Soil does not stop at a city boundary, and neither does this data — every ZIP code above resolves to the same county soil survey. For the individual survey polygons around one address, use the soil map.
Other places in Adams County
Questions about Brighton
Is the soil the same everywhere in Brighton?
No. These values describe Adams County as a whole, which is the unit the soil survey publishes. Within a city, map units change over a few hundred metres — the soil map draws the actual polygons around a point and is the honest answer for one address.
Which contractor should I call in Brighton?
We do not rank or recommend individual firms and we are not one. What this page is for is knowing which kind of work the ground here points to before anyone quotes you, and which claim to check. If you want quotes, the form below passes your request to the named networks.
Does this replace an inspection?
No. It tells you what the ground is; an inspection tells you what your building is doing on it. The useful order is: read this, print the brief for your county, then have someone look.
Get quotes in Brighton
We pass what you enter to the contractor networks listed below. You choose whether to hire anyone.
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