Yes, absolutely. Installing a street bench on a sloped sidewalk is a common urban design challenge, and the legs can most certainly be adjusted to level the bench. In fact, most commercial-grade street benches are designed with this exact scenario in mind.
The key is the type of adjustable leg mechanism. Many heavy-duty street benches come with a threaded foot or a "leveling glide" at the base of each leg. These are essentially large, heavy-duty bolts that screw into the leg itself. By turning one leg’s foot up or down, you can individually raise or lower that corner of the bench to match the slope’s angle. For a typical sidewalk slope of 1-2% for drainage, a simple quarter-turn adjustment on the downhill legs is often enough to make the seat perfectly horizontal.
If your bench does not have threaded feet, you can use metal or hard rubber shims. These are wedge-shaped plates that you slide under the short-side legs. For permanent installations, professional installers often use a different approach: they set the bench’s support posts into a concrete footing that has been pre-leveled using a laser or transit level. This ensures the bench frame is level regardless of the surrounding sidewalk grade. For a surface-mounted bench on a moderate slope, adjustable legs with a 2-3 inch range of movement are the most practical solution.
One important note: for safety and ADA (Americans with Disabilities Act) compliance, ensure that after leveling the seat, the entire bench is stable and does not rock. Always use lock nuts or jam nuts on the adjustable threads so they don’t loosen over time from vibrations. If the slope is extreme (over 5%), you may need a custom fabrication to extend the downhill leg, but for most standard sidewalk slopes, standard adjustable legs work beautifully.