A dock at Lake of the Ozarks tells you when it needs help. The trouble is most owners don't recognize the signals until the damage compounds into a real problem. This guide walks through nine visible warning signs you can spot during a normal walk-around, what each one usually means, and how urgent the fix is.
None of these require a specialist's eye. You can do the walk-through yourself in 15 minutes. If you find more than one or two signs, schedule a free inspection from an Ameren-certified builder before the next season starts.
1. Sagging or uneven dock surface
Stand at one corner of the dock and sight along the long axis. The surface should look reasonably level. If one end is visibly lower than the other, or one corner sits noticeably deeper in the water, the foam billets underneath are failing. Foam absorbs water, gets eaten by waterfowl, or breaks down from sun and ice cycles. A dock that's listing or sinking on one side needs refoaming.
Urgency: high if the list is visible, medium if it's subtle. Refoaming runs $6,000 to $18,000 and requires an Ameren permit. Read the repair vs replacement guide if the sagging is severe.
2. Visible foam billet exposure or wear
Walk to the edge of the dock and look under it. The foam billets should be sealed in their cell structure, not visible directly. If you can see exposed foam, especially foam that looks bitten, cracked, or partially submerged, the billet cells have failed and the foam itself is degrading. This is the same problem as the sagging surface above, just caught earlier.
Urgency: medium. Refoaming is in your near future. The good news: catching it now means less compounding structural damage later.
3. Rusted or fraying cables
Look at the cables that anchor the dock to the shoreline. Inspect at the attachment points where the cable connects to the dock and where it connects to the shoreline anchor. Rust, fraying strands, kinks, or visible corrosion at the eyelets all indicate the cable is past its service life. Galvanized cables typically last 7 to 10 years at the Lake. Stainless steel cables last longer but still degrade at the eyelets.
Urgency: high. Cable failure is dangerous. Replace the full set if any strand shows wear. Cost is $2,000 to $5,000.
4. Loose or rotted decking
Walk every board on the dock surface. Boards that flex underfoot, feel spongy, or have visible rot at the ends are due for replacement. Treated lumber lasts 8 to 12 years at the Lake. Cedar lasts a bit longer with annual sealing. Composite (Trex, TimberTech) lasts 25 to 30 years with minimal maintenance.
Urgency: medium. A single rotted board isn't dangerous, but loose boards become tripping hazards and the rot spreads to adjacent boards faster than you'd think. Section-by-section replacement runs $1,500 to $4,500.
5. Leaning posts or columns
Posts that support a sundeck, roof, or boat house should be vertical. Even a few degrees of lean indicates the post connection at the dock is failing, the post itself is rotting, or the dock framing it sits on is compromised. Multiple leaning posts almost always indicates the underlying dock structure is the problem, not just the posts.
Urgency: high if more than one post is affected. A single leaning post can be reset; multiple posts suggest structural issues that need a CDB's on-site assessment.
6. Lift not lifting or lowering properly
Cycle your lift up and down. It should run smoothly through the full range, without binding, jerking, unusual sounds, or refusing to start. Cable lifts that bind usually need cable replacement, bunk adjustment, or pulley service. Hydraulic lifts that won't cycle properly usually need fluid check, seal replacement, or a service call.
Urgency: medium to high depending on whether your boat is currently on the lift. Cable replacement runs $400 to $1,200. Hydraulic seal work runs $800 to $2,500. A new lift install starts at $4,000 for a 4,000-lb cable lift. See the boat lift buying guide for replacement specs.
7. Cracked concrete
On concrete docks, look at the surface and the visible structural elements (cells, frames, anchor mounts). Surface cracks under 1/8 inch are usually cosmetic. Cracks wider than 1/8 inch, cracks that show exposed rebar, or any cracking near the anchor points is structural and needs a CDB assessment.
Urgency: medium for surface cracks (monitor and schedule inspection), high for exposed rebar or anchor-point cracking (call now).
8. Water intrusion in covered slips
On covered slips and boat house enclosures, look up. The roof should be tight, with no visible water staining on the underside, no drip marks on the dock surface below, and no daylight visible through metal panels or shingle gaps. Water intrusion indicates roof failure, which usually means flashing, fastener, or panel issues.
Urgency: medium. The boat below is getting wet, which accelerates UV and moisture damage to interior finishes. Roof repair runs $1,500 to $8,000 for typical fixes.
9. Tilting or shifting after winter
After winter, compare the dock's position to where it sat the previous fall. If the dock has visibly shifted along the shoreline, rotated, or settled at a different angle, the anchor system took damage during the winter. This is most common on the upper Gravois Arm and other coves that develop partial ice cover.
Urgency: high. Compromised anchoring means the dock can shift further during the next storm. Schedule an inspection before peak boating season starts.
What to do next
If you spotted one of these signs, the right next step depends on urgency. For high-urgency items (cable wear, leaning posts, anchor system damage), schedule a CDB inspection within the next two weeks. For medium-urgency items (decking, covered slip leaks, lift service), schedule before the next peak season starts. For lower-urgency items (sagging that's still subtle, surface cracks), put it on the next routine inspection.
The free on-site inspection from an Ameren-certified builder takes 30 to 45 minutes. The builder confirms what you found, identifies anything you missed, and gives you a written quote for the recommended work. No obligation. Request a free inspection for your Lake of the Ozarks dock.
For a configurable estimate of repair costs before the inspection, use the Dock Budget Planner. For the full cost breakdown by repair type, see the 2026 dock cost guide.