By Roman Ross — Marine Construction Estimator, Shore Protect Construction
The owner of a waterfront lot on Trinity Bay called us with a shoreline that had already been protected once. A row of poured concrete slabs ran along the water's edge, and every one of them had cracked, tipped seaward, or sunk into the bay. Behind that broken line the lawn was being cut back by a clean vertical scarp — the tell that the bank was losing ground even though something was nominally still there. He wanted 150 feet of new wall, and he asked one very good question up front: how much more does saltwater actually cost? This is what the job took, what it cost, and why the old concrete stayed exactly where it was.
Bottom line: In Beach City, TX in 2026, a 150-foot treated-timber bulkhead on Trinity Bay came in at $309 per linear foot — $46,350, and that price includes the trench, the piles, the wall, the tie-backs, the geotextile, the cap and the backfill behind the finished wall. The wall was built in an open trench cut from the bank rather than driven from the water, and the failed concrete slabs were deliberately left in front of it to keep breaking waves.
Trinity Bay is brackish, tidal, and open enough at this stretch that a north wind puts real chop on the bank. The previous owner's answer had been a concrete slab revetment — large flat slabs laid along the shoreline to armour it. That approach works until the slabs lose the ground underneath them. Once the bay scours out the soil beneath an edge, a slab has nothing to bear on, it rotates waterward, and the joint that opens behind it becomes the fastest route for water to get at the bank.
That is what the site photos showed: slabs at every angle, rubble between them, and a raw undercut edge where the grass simply stopped. The diagnostic detail was that the erosion was worst behind the armour, not in front of it — the bank was being lost from the landward side of a defence that had stopped defending. Access, on the other hand, was as good as it gets: flat open lawn running right up to the bank, no overhead utilities, and room for a machine to work the entire 150-foot run. That single fact changed how the wall could be built, and it is a large part of why the number landed where it did. If you want the wider picture for this area, we keep a running breakdown on the Beach City bulkhead cost page.
With about five feet of wall standing above grade on a brackish bay, treated timber is the honest choice. Vinyl sheet pile earns its premium where you need a continuous impermeable face driven deep, and concrete earns its premium where wave energy is relentless or the wall is holding a genuine load. Here the exposed height is moderate, and — critically — the wall was never going to take the bay's full punch, because the old slab line was staying put in front of it. Paying for vinyl or concrete on this shoreline would have bought engineering the site does not ask for.
The honest caveat belongs right next to that decision. This wall is specified for a shoreline that still has a broken slab field absorbing wave energy ahead of it. That is a real condition, not a footnote. We wrote it into the job so that whoever reads the file in ten years knows the assumption. For how the same choice reads on freshwater, where the calculus shifts, see our 100-foot timber bulkhead on a Houston neighbourhood lake; and for a side-by-side of the two materials on a single job, our vinyl versus wood comparison on Lake Conroe sets out where the extra money does and does not buy something.
The instinct on a shoreline like this is to demolish first. We did the opposite, on purpose. Once the new wall line was set on the bank behind the slabs, those slabs no longer had a structural job — nothing was relying on them to retain soil any more. What they still do well is sit in the surf zone and take the energy out of an incoming wave before it reaches timber. Removing them would have added a demolition and hauling cost to the job and simultaneously removed a layer of protection. So they stayed, and the contract says plainly that removing and hauling the existing concrete is not included.
The wall itself is a post-and-board system, tied back. 6x6 treated timber piles carry the wall, with a second row of 6x6 anchor piles set behind them; 3/4-inch thread rods run from the wall to those anchor piles so that the earth pressure behind the wall is resisted by soil, not by the bending strength of the timber alone. Upper and lower horizontal boards span the piles, the vertical wall boards are grooved so the face closes up, and an internal crimping board and an external facing board finish the assembly. A geotextile filter fabric covers the full back face — that is the part that lets water out while keeping the soil in, and it is the single detail most often skipped on cheap walls.
This is the as-built material set for the 150-foot run. Line-item prices are not shown — the wall was sold as a per-linear-foot package, not as a parts list.
A small crew working from the bank, with one compact tracked loader on site for the full run. No barge, no pile-driving rig, no dewatering pump — the whole sequence below happens on dry land behind the water line.
Phase 1 — Delivery and layout. Materials purchased, delivered, unloaded and carried to the work line. The shoreline and the wall alignment are marked out before anything is dug, because on a tidal shoreline the alignment is also the permitting question.
Phase 2 — Trench and piles. The wall trench is cut along the marked line from the land side with the tracked loader. The 6x6 piles are set into the open trench and the anchor piles are set behind them. This is the phase that replaces pile driving, and it is only available because the lot gave us a firm working approach the length of the wall.
Phase 3 — Wall, tie-backs and backfill. Upper and lower horizontal boards go on, then the vertical wall boards, the crimping board and the facing board. Thread rods tie the wall back to the anchor piles. Geotextile is laid down the full back face, the timber cap is fitted along the coastline, and the trench is backfilled with the material that came out of it. The site is graded on the way out.
This wall was contracted at $309.00 per linear foot, $46,350 for the 150-foot run. That is the whole wall — materials, trench, piles, boards, tie rods, geotextile, cap, and the backfill behind the finished wall. Removal and hauling of the existing concrete is the one named exclusion. Payment ran in five stages tied to progress rather than to the calendar: at signing, at material delivery and start of work, after the piles were in, after the wall boards went up, and on completion. Nothing was added after signing — no change orders on this job.
For context, a wood bulkhead in Beach City, TX generally runs $150–$350 per linear foot across the wider market, so this one sits in the upper half of the band. Two things put it there: saltwater exposure, which drives the timber and hardware specification, and roughly five feet of exposed wall height, which drives the pile length and the earth pressure the tie-backs have to handle. If you want to sketch your own run before calling anyone, the bulkhead cost calculator will get you into the right bracket, the Beach City cost breakdown shows what moves the number, and the Beach City bulkhead page covers what we build across Chambers County.
The failure this job replaced is the argument for how it was built. That concrete revetment did not fail because concrete is weak. It failed because water got underneath and behind it and took the soil away, and once the soil is gone the strongest material in the world is just a heavy object sitting at an angle. A timber bulkhead that drains properly outlives a concrete one that does not. That is why the geotextile and the backfill matter more to the service life of this wall than the species of the boards.
Trinity Bay is tidal water over state-owned submerged land, so shoreline work in Beach City can involve the U.S. Army Corps of Engineers Galveston District, the Texas Commission on Environmental Quality and the Texas General Land Office, in addition to whatever Chambers County requires locally. What usually decides the level of review is where the new wall sits relative to the existing shoreline and whether any fill is placed below the tidal line — a wall built on the bank behind an existing armour line is a different conversation from one that advances into the bay. On our contracts the property owner obtains the permits and we build to what the approvals require. We are not going to print a fee figure here, because the honest answer depends on the alignment and on which agency reviews it.
This job in Beach City, TX priced at $309 per linear foot — $46,350 for a 150-foot treated-timber bulkhead on Trinity Bay. That figure covers the whole wall: materials, the trench, the piles, the boards, the tie rods, the geotextile, the cap, and backfilling behind the finished wall. It does not cover hauling away the broken concrete that was already on the shoreline. Across the wider market a wood bulkhead in Beach City, TX generally runs $150 to $350 per linear foot, so this wall sits in the upper half of that band — saltwater exposure and a five-foot wall height are what put it there.
Yes, but far less than most people expect, and the reason is arithmetic. Saltwater raises the cost of the timber and the hardware, because both have to be specified for a marine environment. It does not raise the cost of the excavation, the crew hours, the mobilisation, or the backfill — and on a bulkhead in Beach City, TX those non-material items are roughly half the job. So a premium that looks large on a lumber invoice arrives at the customer as a much smaller premium on the finished wall. A comparable freshwater timber bulkhead on a calm inland lake can come in near $180 per linear foot; this saltwater wall on Trinity Bay came in at $309, and wall height accounts for part of that gap too.
On the right site, yes — and this Beach City, TX job is an example. Instead of working from a barge and driving piles from the water, the crew cut an open trench along the wall line from the land side with a compact tracked loader, set the 6x6 timber piles into that trench, assembled the wall dry, and then backfilled with the same material that came out of the trench. It needs a firm, open approach behind the wall line, which this lot had: flat lawn straight to the bank. Where that approach exists, building from the bank removes the barge, the pile-driving rig and the dewatering pump from the job entirely.
Not always, and on this Beach City, TX shoreline it was deliberately left in place. The old revetment had broken into large slabs that had tipped waterward and partly settled into the bay. Because the new timber wall was set on the bank behind that line, the slabs no longer had to hold anything back — they now sit in front of the wall and break wave energy before it reaches the timber. Removing them would have added cost and taken away that protection. The trade-off is honest and worth knowing: if those slabs are ever cleared out, the wall faces more direct wave load than it was built for, and that is a conversation to have before anyone touches them.
Assume yes and confirm before work starts. Beach City sits on Trinity Bay in Chambers County, which is tidal, state-owned submerged land, so shoreline work can fall under the U.S. Army Corps of Engineers Galveston District, the Texas Commission on Environmental Quality, and the Texas General Land Office, on top of anything Chambers County itself requires. What triggers review is usually the wall's alignment relative to the existing shoreline and whether any fill goes below the tidal line. On our contracts the property owner is responsible for obtaining permits; we build to whatever the approvals require. Do not take a per-job fee figure from an article — including this one — because the number depends on the alignment and the reviewing agency.
On a brackish bay shoreline in Beach City, TX, a properly built treated-timber bulkhead is a 20 to 30 year structure, and what decides where it lands in that range is rarely the timber itself. It is the backfill and the drainage behind the wall. Water that gets behind a bulkhead and cannot leave will push the wall out long before the wood gives up, which is why the geotextile behind the full face is not an optional line item. Our workmanship warranty on this job runs one year and specifically excludes damage from weather, water conditions and soil movement — so the honest way to read the lifespan is that the structure is built for decades while the warranty covers our work, not the bay.
We build and repair timber, vinyl, steel and concrete bulkheads across Chambers County and the wider Galveston Bay system — Beach City, Anahuac, Baytown, Kemah, Seabrook and the Trinity Bay shoreline in between. Send us the length of your run and a photo of what is failing and we will tell you honestly whether it needs a wall, a repair or nothing yet. Start on our contact page.
Shore Protect