Northwest Hills, Austin
Pool service in Mount Bonnell
Sullivan’s services pools along Mount Bonnell Road and the streets above Lake Austin. These are the most physically demanding properties on our route: pools cantilevered over the river valley, equipment a long way from the water, and elevation changes that would be a design feature anywhere else and are an engineering constraint here. Negative-edge and perimeter-overflow pools are common enough that they shape the work.
Where Mount Bonnell is, and what the ground does
Mount Bonnell runs about two and a quarter miles across. Its residential streets run from 508 ft to 840 ft above sea level — a fall of 332 ft along the streets themselves, and 380 ft boundary to boundary. The difference is the ground the houses are not on — greenbelt, gorge or park. The contour lines on the map are the same survey those numbers come from, and they cover the full frame.
- Mount Bonnell
- neighboring areas
- 80 ft contours
- creeks
- main roads
Mount Bonnell is a landmark rather than a platted neighborhood, so it has no boundary of its own in any public dataset. The outline here is Highland Park, the area that contains it, and the marker is the summit. We would rather show you whose line this is than draw one that does not exist.
Edwards limestone, west of the Balcones Escarpment. Boundary: City of Austin Neighborhood Reporting Areas. Contours: City of Austin 2021 LiDAR. Creeks: City of Austin. Roads: US Census TIGER.
Mount Bonnell’s streets run from 508 ft to 840 ft — a 332 ft fall
That is some of the steepest ground in our whole footprint, running off the summit down to Lake Austin. Pools up here are engineering before they are amenities: cantilevered decks, pads benched into rock, and equipment runs that climb or drop further than most people expect. Two things follow. Static head is the number that sizes a pump here, not flow rate, and an undersized pump does not fail loudly — it just never quite turns the water over, and the pool is faintly cloudy all summer for no reason anyone can find. And thin soil over limestone means what falls on the slope reaches the water fast.
The creeks draining this ground are Dry Creek North, Huck's Slough, Johnson Creek, Lake Austin, Taylor Slough North. Creek-side pools in Austin get two things the rest do not: more organic debris blowing off the corridor, and a faster, dirtier rise after a storm. Both are chlorine demand, and both are why a pool a street from the creek and one four streets away are not the same weekly job.
What Mount Bonnell is like to work in
- When it was built
- Mixed, from mid-century houses to recent architectural rebuilds.
- The lots
- Dramatic cliffside and river-view lots with severe elevation changes.
- What falls in
- Cedar and oak clinging to thin soil over rock.
- Getting to the pool
- The most demanding access we deal with — long, steep, narrow drives.
What we watch for here
- Negative-edge and overflow designs have a catch basin with its own level and its own pump — a second system that needs watching.
- Severe elevation between pad and water makes priming and air-leak problems the default suspects.
- Wind exposure on a clifftop lot puts more in the water than the surrounding tree count would suggest.
The ground under Mount Bonnell
Edwards limestone, west of the Balcones Escarpment. Thin soil over rock, steep lots, and a canopy of live oak and Ashe juniper. Decks stay put, but the leaf and pollen load is heavy from December through April and skimmer baskets fill fast.
What we do in Mount Bonnell
- Weekly pool cleaning and maintenance Same day each week. Water balanced, surfaces cleaned, equipment checked.
- Pool filter cleaning Cartridge, DE and sand — cleaned on pressure rather than on a calendar.
- Spa and hot tub service Attached spas and standalone tubs. Different chemistry, different schedule.
Mount Bonnell — questions people ask
Do you service negative-edge and infinity pools?
Yes. The important part is that they are two systems rather than one — the pool and the catch basin — and the basin level, its pump and its own chemistry all need checking. A negative-edge pool serviced as if it were a conventional one will look fine and quietly develop problems.
Do you service pools on Mount Bonnell Road?
Yes, including the steep and narrow-access properties above the river. Those are quoted for what they actually take rather than on a standard residential slot.
Pool service in Mount Bonnell?
We are on these streets most weeks. Tell us the pool and we will quote it.