Dams and spillways are hard to look at. The faces are tall, the downstream slopes are steep, the spillway channel may be wet or fenced, and getting a person close to the concrete often means rope access, a boat, or a lift. That's why owners, operators, and engineering firms increasingly hire a drone pilot for dam inspection support: a drone can capture consistent, close, georeferenced imagery of the whole structure in a fraction of the time, so the engineer can spend their time on judgment instead of access.
This guide explains what drone support for dam and spillway inspection looks like, what to ask for, and how to hire the right pilot.
What a drone adds to a dam or spillway inspection
A drone does not replace the engineer or the inspection program the dam is held to. It supports them by collecting better visual data. Common uses include:
- Upstream and downstream face imagery for cracking, spalling, efflorescence, and seepage staining.
- Spillway channel and chute documentation, including joints, erosion at the toe, and debris.
- Embankment surveys for sloughing, animal burrows, vegetation, and wet areas on the downstream slope.
- Orthomosaics and 3D models that give a measurable baseline to compare year over year.
- Thermal imagery, in some conditions, to help flag areas worth a closer look for seepage. Results depend heavily on weather and timing, so treat thermal as a screening tool.
- Post-event documentation after high water, so the owner has a record quickly.
Deliverables to request
Be specific about what you want delivered. Typical items:
- High-resolution still photos organized by structure area, with locations.
- An orthomosaic of the dam crest, embankment, and spillway area.
- A 3D model or point cloud of concrete faces for measuring and comparing.
- Close-up imagery series of known features the engineer is tracking.
- Optional thermal images with capture time and conditions noted.
- A flight summary: date, time, weather, aircraft, and areas covered.
Ask the pilot to name files so they map back to your inspection checklist. A thousand unsorted photos are not a deliverable.
How to hire the right drone pilot
Part 107 and insurance
Any commercial operator flying in the US needs an FAA Part 107 remote pilot certificate. Ask for it, plus a certificate of insurance naming you or the owner if your contract requires it.
Airspace and site authority
Some dams are near airports or sit inside controlled airspace. Some owners also have security rules. A good pilot checks airspace ahead of time, gets any needed authorization, and coordinates access with the dam owner well before the flight date.
Experience with structures
Flying close to a tall concrete face is different from mapping a field. GPS can degrade near large structures, and wind behaves differently around a spillway. Ask for examples of bridge, facade, or other vertical-structure work.
Data handling
Ask how imagery will be organized, how it will be delivered, and how long the pilot keeps the raw data. For repeat inspections, consistency matters: same flight patterns, same overlap, same viewpoints, so this year can be compared to last.
Questions to ask before you sign
- Which aircraft and camera will you use, and why for this structure?
- How will you capture the faces: photo grid, oblique passes, or close-up manual series?
- What ground sampling distance will the close-up images achieve?
- Will you need ground control points for the orthomosaic or model?
- How do you handle wind and water spray around the spillway?
- What will the delivered folder look like?
Planning and timing
Calm, overcast days are often best for even lighting on concrete. Lower reservoir levels can expose more of the upstream face. For thermal screening, timing relative to sunrise and recent weather matters. Plan with the engineer so the flight supports what they actually need to evaluate.
Find a dam inspection drone pilot
When you're ready to hire a drone pilot for dam inspection support, post the job on Find a Drone Pilot with the structure location, the areas to cover, the deliverables you need, and your timeline. Qualified Part 107 pilots can respond, and you can compare experience and approach before you choose. If you also manage bridges or other civil structures, see our guide to hiring a drone pilot for bridge inspection.