Concrete vs Rip Rap Seawall on a Drainage Channel — 80 ft in Arlington Heights, IL

By Roman Ross — Marine Construction Estimator, Shore Protect Construction

A homeowner in Arlington Heights, Illinois sent us four photos of a drainage channel running along the back of the yard, where an old low concrete edge had cracked through and the bank beneath it was quietly washing into the water. The owner did not want the old wall torn out — the ask was simple and smart: build something new in front of it, backfill with dirt, and stop the erosion. The owner also floated the real question out loud — "some type of concrete or stone would probably be good" — and asked for suggestions. So we priced both: a new poured-concrete wall and a rip rap stone revetment. Below is the full trade-off, both quotes as delivered, and how to choose between them on a low freshwater channel like this one.

The Site: 80 LF of Failing Concrete on a Drainage Channel in Arlington Heights

The property backs onto a slow, freshwater drainage channel — no tide, no saltwater, no corrosion to engineer around, but a real current when the channel runs after a storm. Along the top of the bank sits an old poured-concrete edge, roughly 2 feet tall, running the full 80 linear feet. It is past repair: the slab is cracked clean through in places, streaked with the white mineral bloom that comes from water moving through failing concrete, and — the real problem — undermined at its base. The soil is washing out from under the toe, the grassy slope below is sloughing into the channel, and a handful of loose fieldstones already sit in the water where someone tried to slow it years ago.

Two facts shaped both quotes. First, access is easy — there is an open lawn behind the wall, so a compact excavator can stage on the bank and no barge is needed. Second, the failure is a toe problem, not a wall-face problem: the water is undercutting the base, so whatever goes in has to reach down past the scour line and lock into stable ground. That single diagnostic tell is what makes both a deep concrete footing and a keyed rip rap toe valid answers — and it is why a simple patch on the old wall would have washed out again within a season. For where these figures sit against the broader market, see our seawall construction and repair cost in Illinois page.

The Decision: New Concrete Wall vs Rip Rap Stone

Both options will hold this bank, and both are built in front of the old wall so nothing gets demolished. The difference is what you are buying. A concrete wall is a hard vertical face — a permanent curb between lawn and water that you can mow right up to. Rip rap is a sloped blanket of heavy stone that armors the bank and lets it drain, blending into the shoreline rather than replacing it. On a saltwater coast the decision often turns on corrosion; here, in freshwater, neither material is fighting the water at all, so it comes down to cost and the finished look.

The honest read for this bank: rip rap is the value pick, and for a low channel edge whose only job is to stop the water from undercutting the yard, value is usually the right call. It costs roughly $13,000 less, it flexes with the ground instead of cracking the way the old wall did, and if a big flow ever nudges a few stones you top them back up in an afternoon. The concrete wall earns its premium when the owner wants a hard, mow-to-the-edge line, the longest possible service life, or the cleanest finished look along the lawn. For the same freshwater material trade-off on a bigger Illinois river, see our vinyl vs steel seawall on the Rock River in Rockford, and for the stone side in depth, our rip rap rock and boulder shoreline guide.

Why the New Structure Goes In Front of the Old Wall — and Why We Kept the Demolition Off the Bill

The owner asked us not to remove the old wall, and that instinct saved real money. Tearing out 80 feet of buried concrete is slow, messy demolition and haul-off — and here it buys nothing. The old wall is failing as a retaining face, but as dead mass sitting behind a new structure it is harmless. So on both quotes the demolition line is zero. We build on the channel side of the existing edge, where the new work reaches into ground the old wall never protected, and the old slab simply becomes a buried backstop.

For the concrete option, that means excavating a footing trench along the outer face, tying a steel rebar cage, and drilling epoxy-set dowels into the old wall so the two lock into one section. For the rip rap option, it means cutting a keyed toe trench at the waterline in front of the old edge and laying the stone blanket up the slope against it. In both cases the last step is the same one the owner asked for: backfill the gap behind the new work with dirt, compact it, and grade it flush to the lawn.

Materials & Specifications: What Goes Into 80 LF on the Channel

Below is the as-quoted material set for each option, taken from the client quotes. Both share the same erosion-control backbone — a filter fabric that lets water pass but holds soil in, a crushed-stone drainage layer, and dirt backfill graded to the lawn. The concrete option adds the poured wall and its reinforcement; the rip rap option puts the money into stone instead of concrete and forms.

One detail worth calling out on both options: the drainage fabric is not optional. The old wall failed partly because water had nowhere to go — it built up behind the concrete and pushed the soil out at the base. The filter cloth and crushed-stone layer behind the new work relieve that pressure so the same failure does not repeat, whether the face is stone or concrete.

Phase-by-Phase Execution Plan

Both options break into the same three phases. The rip rap option runs 4 working days with a four-person crew and an excavator; the concrete option runs 7 working days and adds a second carpenter because 80 feet of two-sided wall forms is form-heavy. Both timelines assume the permit path is settled before day one.

Phase 1 — Site Preparation. The crew stages on the lawn behind the wall — no barge needed. The new work line is marked along the outer face of the old edge, path lights and the planting bed are protected, and a compact excavator opens the work: a footing trench for the concrete option, or a keyed toe trench and a re-graded slope for the rip rap option. A pump keeps the trench dry near the water line.

Phase 2 — Structural Installation. For concrete, the crew ties the rebar cage, drills and epoxy-sets dowels into the old wall, sets the forms, and pours a 3,000 PSI wall on a footing that reaches below the scour line; the forms come off once it cures. For rip rap, the crew lays 8 oz geotextile up the slope, places a #57 bedding layer, then stacks the Class B stone with the excavator, keying the bottom row into the toe trench and sloping the blanket from the water up to the lawn.

Phase 3 — Drainage, Backfill & Cleanup. On the concrete option, weep holes are drilled and a drainage layer plus filter fabric go in behind the wall. On both options, the gap behind the new work is backfilled with dirt, compacted, graded flush to the lawn, seeded, and all debris is hauled off.

Cost Anchor: What 80 LF Costs in Arlington Heights in 2026

For this 80 LF Arlington Heights channel bank, the quotes came in at $248 per linear foot for rip rap ($23,053 total) and $395 per linear foot for a new concrete wall ($36,150 total). Each price is all-in for its option: it carries the dirt backfill the owner wanted, the permit and mobilization, and — because the old wall stays in place — no demolition charge on either. Both are pre-measure estimates; final pricing still depends on the site measure and the permit determination, but they are real numbers, not pre-permit teasers. Payment on either option is 50% at deposit and 50% on completion.

Pricing your own stretch of shoreline? Our free seawall cost calculator covers concrete, rip rap and sheet-pile walls by the linear foot. Across Illinois, a new seawall generally runs $150–$500 per foot for rip rap and $300–$1000 per foot for poured concrete, depending on height, access, and permitting — our Illinois seawall service overview walks through what that looks like across the North Shore, the Fox River, the Chain O'Lakes, and inland channels like this one. Short runs tend to price higher per foot because fixed mobilization spreads over fewer feet; a straight 80-foot run with open lawn access, like this one, sits at the efficient end.

Lifespan & Long-Term Cost of Ownership

The upfront price is the easy number. The more useful one is what each option costs you to own over the decades — and here the low, calm, freshwater setting keeps both cheap to keep.

Permitting Shoreline Work in Arlington Heights and Cook County

Work on a drainage channel in Arlington Heights usually touches more than one desk, and the exact mix depends on who regulates the channel. Plan on a Village of Arlington Heights building and engineering permit. Because the work is in or beside a Cook County drainage channel, expect a review under the Metropolitan Water Reclamation District of Greater Chicago (MWRD) Watershed Management Ordinance. And if the channel is a designated public water of the state, the Illinois DNR Office of Water Resources reviews it as well.

We confirm that jurisdiction first, and can either carry the applications for the owner or file alongside an owner who prefers to hold the permits — whichever path is chosen goes into the contract. One honest caveat on the concrete option: a reinforced wall next to a regulated channel can trigger an engineer's stamp, which is not carried in the estimate above; if the site turns out to need one, that fee is billed at cost after we confirm the jurisdiction. The common mistake either way is signing a build contract before the permit path is settled — settle it first, then schedule the crew.

Frequently Asked Questions

For a freshwater drainage channel in Arlington Heights, is concrete or rip rap the better seawall?

Both stop the erosion. For a low, roughly 2-foot bank on a freshwater drainage channel in Arlington Heights, rip rap stone is usually the value answer — it costs about $13,000 less on this run, looks natural, flexes with the ground instead of cracking, and is easy to top up years later. A new poured-concrete wall is the premium answer: it gives you a hard vertical edge you can mow right up to, the longest service life, and almost no upkeep. Neither is fighting saltwater corrosion here, so the choice comes down to budget and the look you want, not durability against the water.

Can you build the new seawall without removing my old wall?

Yes — and on this Arlington Heights project that was the plan. We build the new structure on the channel side, in front of the existing wall, and leave the old wall in place as a buried backup. That drops the demolition line to zero and keeps the cost down. For the concrete option we pin the new wall into the old one with epoxy-set steel dowels; for the rip rap option the stone simply armors the bank in front of it. Either way, the gap behind the new work is backfilled with dirt and graded flush to your lawn.

What does a seawall cost per linear foot in Arlington Heights in 2026?

On this 80-foot Arlington Heights project the rip rap stone option came in at $248 per linear foot ($23,053 total) and the new poured-concrete wall at $395 per linear foot ($36,150 total). Both totals include the dirt backfill behind the new work, the permit and mobilization, and neither carries a demolition charge because the old wall stays in place. Those are all-in numbers for this specific bank; final pricing still depends on a site measure and the permit determination, but they are real figures, not pre-permit teasers.

Which lasts longer and needs less maintenance — rip rap or concrete?

The concrete wall is the longer-lasting, lower-maintenance of the two in Arlington Heights. A properly built reinforced-concrete seawall on a calm freshwater channel can hold for 40-plus years with almost nothing to do but keep the weep holes clear. Rip rap is extremely durable too — the stone itself never wears out — but a low blanket can shift or settle over the years and occasionally needs a few stones reset or topped up, especially after a heavy flow event. Neither corrodes, because there is no saltwater here.

Do I need a permit for shoreline work on a drainage channel in Arlington Heights?

Most likely yes, and it depends on who regulates the channel. Plan on a Village of Arlington Heights building and engineering permit, and — because the work is in or beside a Cook County drainage channel — a review under the Metropolitan Water Reclamation District of Greater Chicago (MWRD) Watershed Management Ordinance. If the channel is a designated public water of the state, the Illinois DNR Office of Water Resources also reviews it. We confirm the jurisdiction first and can carry the applications for you or file alongside you. The common mistake is signing a build contract before that determination — settle the permit path first.

Which option is cheaper up front, and is the cheaper one the right call for my bank?

Rip rap is the cheaper option up front in Arlington Heights — $23,053 versus $36,150 for the concrete wall, about $13,000 less. For a low, roughly 2-foot bank whose main job is to stop the channel from undercutting your yard, the cheaper option is usually the right one: rip rap does exactly that, looks natural, and is easy to maintain. Step up to concrete when you want a hard, mow-to-the-edge vertical face, the maximum service life, or the cleanest finished look along the lawn. There is no wrong answer here — both fix the erosion.