Platte River Sand, Bluff Grades, and Nineteenth-Century Flatwork
Ashland has better natural subgrade than most of the towns around Lincoln, and the reason is the Platte. Much of the low ground and the terraces are sand and gravel laid down by the river — the same deposits that support the sand and gravel operations along that corridor. As a base to build a slab on, clean sand is excellent news: it drains, it compacts predictably, and it does not swell or shrink with moisture the way clay does. The catch is that it also drains water toward things, and loose sand will migrate if water is moving through it, so edges and drainage detailing matter. A slab on sand with an eroding edge is a slab losing its support at the perimeter first.
Up on the bluffs and the higher ground it is loess again, and there the usual eastern Nebraska rules apply: excellent while dry, weaker when thoroughly saturated, so drainage away from concrete is not decoration. Bluff lots add grade. Patios and walks on a sloping lot need real thought about how water crosses them — a slab that catches sheet flow from uphill and holds it against a house is worse than no slab at all. Steps down a grade change need footings below frost depth at every landing, not just at the top, and they need consistent rise and run across the whole run, which is where most homemade step work goes wrong.
The old downtown and the older residential blocks carry the same problem as every nineteenth-century Nebraska town: unreinforced, non-air-entrained flatwork that has been through more than a hundred winters. Air entrainment did not become standard practice until the mid-twentieth century, and concrete without it loses paste off its surface every freeze-thaw cycle. A hundred and twenty Nebraska winters produces the sandy, aggregate-exposed surface you see on the oldest walks in town. That is scaling, it cannot be overlaid successfully, and those panels want replacing rather than patching.
Being close to the river has one more practical consequence worth naming. Ground that has been saturated by high water and then dried does not always come back to exactly where it was, and low-lying properties along the Platte have been through that more than once. If your slab is in that band and it has moved, the honest first question is whether the ground is finished moving. Sometimes the right advice is to fix the drainage, wait a season, and then pour. We would rather say that than sell you a slab that is going to follow the ground down.
What we pour in Ashland
- Driveways, replacements, and widening strips
- Patios, walkways, and outdoor living slabs
- Front steps, stoops, and porch slabs on proper footings
- Garage, shop, and outbuilding floors
- RV, boat, shed, and equipment pads
- Repair, resurfacing, slab lifting, and removal
