Cracks. Leaning. Undermining. Most seawalls have never been formally inspected. Repairs cost $1–3K per foot and take months. We use drone photogrammetry and underwater ROV to show you exactly what's vulnerable — before the next hurricane.
We fuse bacteria counts, water chemistry, and emerging contaminants into one 0–100 Water Health Score — because seawalls only matter if they're protecting clean water. Explore water quality →
Most seawalls were built 30–50 years ago. Some are failing now. But cities published climate plans listing seawall upgrades as critical — while owning almost none of them. Property owners see damage and guess on repair decisions. Nobody has a complete inventory.
Public adaptation strategies say "upgrade aging seawalls" but city officials can't tell you which ones exist, how old they are, or what condition they're in. 80%+ are privately owned.
An HOA notices cracks in the seawall. They get a repair quote ($1–3K per foot). Do they repair now or wait? Can they get permits before hurricane season? Will the seawall hold until next year?
County assessor records, property deeds, and scattered inspection reports exist — but no one has pulled them into a usable assessment. It takes weeks of research to even understand a single property's seawall.
The seawall you see above water is half the story. We use two tools to capture the whole structure — surface damage, geometry, and what's happening below the waterline.
Overlapping aerial photos are stitched into a 3D model and orthomosaic. We measure surface condition, cracks, geometry, and displacement.
A tethered ROV descends to inspect the submerged face, foundation, and drainage — the hidden critical areas.
Every assessment becomes a detailed report with a condition score, photographic evidence, prioritized repair recommendations, and resilience metrics for storm surge.
What crack patterns mean. Why undermining spreads. How long repairs actually take. Read expert breakdowns of the seawall crisis in South Florida.
Vertical vs. horizontal vs. diagonal cracking — what each tells you about the seawall's structural integrity and urgency.
How long do repairs actually take? Permitting, contractor schedules, hurricane season cutoffs, and realistic timelines for South Florida.
What we found at Village Circle Marina: 42-year-old concrete, severe cracking, foundation scour, and the repair window before 2026 hurricane season.
Get a drone + ROV assessment of your property's seawall, complete with condition score, repair priorities, and storm-surge resilience metrics.
Map your seawall →Spokes are colored by source. Faded = no public feed — WaterVue's coverage gap.
Cities say seawalls are critical. But 80%+ are privately owned, unmapped, and un-inspected. WaterVue locates every seawall, assesses its condition using drone photogrammetry and underwater ROV, and tells you what's vulnerable before the next storm.
Miami, Fort Lauderdale, and their suburbs all list "upgrade aging seawalls" in their climate adaptation plans. Property owners see cracks and slumping, but repairs cost $1–3K per linear foot. And the whole system — which seawalls exist, how old they are, what material, how much wave exposure each face — is scattered across county assessor records, property deeds, and homeowner memories.
Cities publish climate adaptation strategies naming seawall resilience as critical infrastructure. But they don't own most of them — and don't have an inventory of what exists or its condition.
An HOA or homeowner sees their seawall cracking, slumping, or eroding. A repair quote arrives. They approve or defer — guessing whether failure is years away or imminent.
Drone photogrammetry captures the geometry and surface condition. An underwater ROV inspects the structure below the waterline. You get a condition score, a prioritized repair list, and resilience benchmarks.
The seawall you see above water is half the story. Cracks, settlement, and material degradation happen on both sides. We use two tools to see the whole structure.
A DJI Phantom or Mavic flies the seawall perimeter and takes overlapping photos from multiple angles. Photogrammetry software stitches them into a 3D model and orthomosaic (pixel-accurate overhead view).
A small tethered underwater ROV (remotely operated vehicle) descends below the waterline to examine the submerged face, foundation, and drainage system.
Every assessment becomes a detailed report with a condition score, photographic evidence, prioritized repair recommendations, and resilience metrics for storm surge and sea-level rise.
Use the WaterVue seawall map to locate vulnerable segments and see condition assessments across the coast — then commission your own property survey.
Explore the map →The score is deliberately transparent: every input, its limit, and its source are published so a city manager, an HOA, or a scientist can check the math.
Each parameter is evaluated against an established permissible limit drawn from EPA and APHA guidance and the MTAC core-indicator protocols. A reading inside its ideal band scores 100; the sub-score declines as the value moves past the threshold. Sub-scores are then weighted — core indicators and health-critical contaminants count for more — and averaged into a single 0–100 Water Health Score, translated to an A–F grade.
Where a parameter has no data for a site, it is shown as a gap rather than scored as zero, so sparsely-monitored sites are not unfairly penalized. The score reflects only what is measured, and the map makes the missing pieces explicit.
A representative slice of the WaterVue parameter set and the limits each is scored against:
| Parameter | Ideal / limit | Family | Source |
|---|---|---|---|
| Enterococci (bacteria) | 0–35 good · 70+ unsafe (MPN/100mL) | Biological | Waterkeeper |
| Dissolved oxygen | ≥ 5 mg/L | Core | DERM |
| Chlorophyll a | 25–30 µg/L | Core | DERM |
| Water clarity / turbidity | 1–5 NTU | Core | DERM |
| Total nitrogen | 2–6 mg/L | Core | DERM |
| Total phosphorus | < 40 ppm | Core | DERM |
| pH | 6.5–8.5 | Physical | DERM |
| Salinity | 1 ppt fresh · 35 ppt marine | Physical | DERM |
| Temperature | Use-dependent (10–20 °C oyster) | Physical | DERM |
| Heavy metals (mercury) | 2 µg/L | Chemical | WaterVue |
| PFAS | Emerging — no public feed | Chemical | WaterVue |
| Microplastics | Emerging — no public feed | Visual/Remote | WaterVue |
Weekly enterococci sampling on the EPA 2012 recreational thresholds (Good 0–35, Moderate 36–69, Poor 70+ MPN). Waterkeeper's numeric results publish to a shared spreadsheet with a machine-readable export; the state's Healthy Beaches program fills official beach sites.
A surface-water monitoring program running since 1979 collecting physical and chemical parameters across Biscayne Bay and major canals monthly, served from an ArcGIS map service with a queryable data layer.
Real-time Datasonde telemetry plus lab panels close the gaps public programs leave open — PFAS, microplastics, trace metals, and eDNA — on a continuous or monthly basis.
All monitoring follows standard EPA and APHA protocols: calibrated instruments, certified labs, trained personnel, and periodic audits, consistent with WaterVue's field program for the Himmarshee Canal pilot.
Each site marker carries two data layers at once: the fill color is the Water Health Score, and the outer ring is the current swim status from Waterkeeper's weekly bacteria sampling. In the site panel, the radar's spokes and the parameter rows are colored by source, and faded spokes mark parameters no public program currently measures.
Note on this pilot build: site locations, parameters, sources, and the bacteria thresholds are real. Displayed numeric values are representative pending the live data connection described above.
WaterVue maps, measures, and monitors coastal waters so communities can act on real conditions — not outdated assumptions.
In coastal areas, the interconnectedness of ecosystems means a single test can't tell the whole story — when one canal shows signs of pollution, the problem usually extends beyond that site, and traditional monitoring can't map those connections. WaterVue builds an interconnected system of information that maps, measures, and monitors waters in one view, establishing benchmarks based on reality rather than reacting after damage is done.
The pilot fuses Miami Waterkeeper, DOH Healthy Beaches, and Miami-Dade DERM data across recreation sites, marinas, and canals from Key Biscayne to the Miami River. It runs alongside WaterVue's field work on the Himmarshee Canal — a six-month water-quality monitoring program for the Oyster Institute's BioCarbon restoration trial, establishing the standard protocol we apply everywhere else.
Fund monitoring at a canal, marina, or beach you care about. Sponsorship covers lab supplies, analysis, and staff time — and puts a new site on the public map.
Cities, HOAs, restoration groups, and researchers can commission monitoring and receive baseline data, benchmark reports, and a user-friendly interface.
Expert breakdowns of failure modes, repair timelines, cost analysis, and what's at stake. Because understanding your seawall is the first step to protecting it.
Why cracks matter: Cracks aren't just cosmetic — they're the seawall's signal that concrete is under stress, water is infiltrating, and structural failure may follow. The pattern and location of cracks tell you which forces are winning: vertical pressure, lateral soil movement, water pressure, or salt corrosion.
What they mean: Vertical cracks running top-to-bottom indicate the seawall is being pulled apart — usually by water pressure building up behind it, or by thermal expansion as concrete ages. These cracks allow water to penetrate deeper into the wall, accelerating internal corrosion of rebar.
Storm-readiness impact: High. Vertical cracks are structural concern and allow wave overtopping to seep into the base. Repair timeline: 1–2 years, repair cost per linear foot: $800–1,500.
What they mean: Horizontal or stepped cracks indicate the seawall is shearing — the upper portion is trying to move differently from the base. This usually means the foundation is settling unevenly or erosion is undermining one section. Horizontal cracks are a sign of foundation failure.
Storm-readiness impact: Critical. Horizontal cracks indicate the seawall is losing structural integrity. A storm surge can cause catastrophic failure. Repair timeline: 6 months to 1 year (urgent), repair cost: $1,200–2,000 per linear foot or replacement.
What they mean: Diagonal cracks emanating from corners or where the seawall meets other structures indicate differential movement — one section of the seawall is moving while another is stuck. Often caused by uneven soil settlement or wave impact concentration.
Storm-readiness impact: Moderate to high. These cracks indicate localized stress and can spread during a storm. Repair timeline: 1–2 years, repair cost: $600–1,200 per linear foot.
What they mean: A dense network of small, interconnected cracks indicates the concrete is experiencing uniform stress across a large area — usually thermal cycling or salt corrosion deep in the concrete. This is often called "crazing" or "map cracking."
Storm-readiness impact: Moderate. While individual cracks are small, the pattern indicates the concrete is weakening uniformly. Sealing is important to prevent water infiltration. Repair timeline: 2–3 years, repair cost: $400–800 per linear foot.
Why undermining is the silent killer: Undermining — when water and soil erode the foundation beneath a seawall — is invisible until it's catastrophic. A seawall can look intact while its foundation disappears, leading to sudden failure in a storm.
Waves and tidal currents begin eroding soil at the base of the seawall. A small void may form at the toe (base) of the seawall, usually only a few inches deep. Visible signs: Sand or soil appearing at the waterline, small holes at the base, or seepage.
Action: This is the best time to intervene — repairs are minimal (adding fill, installing scour protection). Cost: $300–600 per linear foot.
The void grows as more soil erodes. The seawall begins to settle or tilt slightly. Cracks appear at the base or along the wall. The drainage system (weeping holes) may become exposed or clogged. Visible signs: Larger voids, visible tilting, new cracks, water pouring from weeping holes.
Action: Repair is now more complex — requires underpinning (adding support beneath the wall). Cost: $1,000–2,000 per linear foot, timeline: 2–4 months.
The void has grown beneath 30%+ of the wall. The seawall is leaning, settling noticeably, or moving sideways. Major cracks are visible. A moderate storm can trigger collapse. Visible signs: Obvious lean, large settlement, major cracks, seepage, exposed rebar.
Action: Repair or replacement is urgent — storm season deadlines become real. Cost: $1,500–3,000+ per linear foot, or $500,000+ for replacement of a large seawall. Timeline: 3–6 months for structural repair (if possible before hurricane season).
Cost: $800–1,500 per linear foot. A 300-foot seawall: $240,000–450,000.
Timeline: 2–4 months design + permitting, 2–3 months construction. Total: 4–7 months. Best done in off-season (May–August).
Lifespan: 15–25 years for a good repair on a seawall with solid foundation.
Cost: $1,500–3,000+ per linear foot (depends on material — steel sheet pile, vinyl, precast concrete). A 300-foot seawall: $450,000–900,000+.
Timeline: 3–6 months permitting + design, 3–4 months construction. Total: 6–10 months. Also best done off-season.
Lifespan: 40–50+ years with modern materials and maintenance.
Rule of thumb: If repair cost exceeds 50% of replacement cost, replacement is usually better. If your seawall is 40+ years old with multiple failure modes, replacement extends your safety margin another generation.
South Florida's hurricane season runs June 1 – November 30. Seawall repair permitting and construction almost always stops by May 1 to avoid the season. Here's the timeline:
The implication: If you discover a critical seawall condition (score < 30) in May, you're already missing the current year's repair window. You'll wait until the next January to start. That's up to 8 months of elevated storm risk.
The seawall: A 450-foot concrete sheet-pile wall built in 1982, fronting the North Bay Village marina and residential area. Material: 0.375" steel sheet pile with wooden cap, age 42 years.
Condition: Severe. Score: 35 (critical). Multiple vertical cracks (some 0.25" wide), horizontal cracking at the 4-foot elevation (indicating shear), exposed rebar on the south end, efflorescence (salt staining), and visible undermining with a 2-foot void at the base of the south section. The wall is leaning slightly toward the water.
The risk: A Category 4 hurricane storm surge (8–12 feet above mean high water) would likely overtop the wall and potentially cause collapse of the compromised south section. Residents and property in the area would face immediate flooding and structural damage.
Repair options and costs:
Recommendation: Option 2 (full replacement) is the most prudent despite higher upfront cost. The seawall is 42 years old and showing multiple failure modes; a repair would extend life only 15–20 years, at which point another costly repair would be needed. A replacement gets another 40–50 years and improves resilience to future climate scenarios (higher storm surge, sea-level rise).
Timeline to repair/replace: June 2025 assessment → July–August 2025 permitting → December 2025 – April 2026 construction → May 2026 completion before hurricane season. If delayed to 2027, the wall operates another full hurricane season at elevated risk.
Before you commission a full drone + ROV survey, do a visual walkthrough of your seawall. Look for these signs:
If you check 3+ boxes, contact a structural engineer or commission a WaterVue assessment. If you check 6+, your seawall needs urgent attention — plan repair/replacement in the next 12–18 months.