Denver Concrete Ponds

A pond is a machine you happen to enjoy looking at. Something is always running: a pump pushing water, a skimmer pulling leaves off the surface, a bottom drain doing quiet work you never see. The concrete is the part nobody thinks about, right up until it becomes the only thing they think about, which is the week the level starts dropping and nobody can say why.

So we build basins around the jobs you'll actually do. Where you stand to empty the skimmer. Whether the valves are in one box or scattered across the yard. How you reach the middle without wading. Watertight is the baseline. Easy to run is what makes people keep the thing instead of filling it in four years later.

What running one really looks like

Weekly is small. Empty the skimmer basket, net whatever blew in, glance at the level, rinse a filter pad. Ten minutes on a Saturday. Monthly you pull the pump strainer and look at it. Twice a year you do the real work: a spring startup with a partial clean, and a fall shutdown where you net the surface and cut plants back before they drop into the water and rot all winter.

Denver adds a few wrinkles. Our air is dry, so evaporation runs faster than people expect and topping off is routine rather than a symptom. Wind loads the surface with debris from three yards over, and hail arrives without much warning, leaving grit in every joint. Most of the basins we build sit in the deeper back yards of Park Hill, University Hills, and Wash Park, where there's room to hold a pond well away from the house. And winter is long enough that the surface freezes solid across the top, which is fine for the concrete and fine for fish as long as gas exchange keeps happening through a de-icer or an aerator.

Details that make the weekly jobs short

• Skimmer on the downwind side, where debris already collects
• Bottom drain plumbed to the filter so sludge leaves without a shop vacuum
• A submerged shelf wide enough to stand on when you reach the middle
• Valves grouped in one accessible box instead of scattered around the yard
• Overflow routed away from the house, sized for a hard afternoon storm
• Solid dry footing at the filter, not the patch of mud it always becomes
• Textured coping edge, because that's the spot people step on while carrying a net

Watertight gets decided on pour day

Concrete holds water when the details do. We reinforce walls and floor as one structure, place continuously where the shape allows, and where a cold joint is unavoidable we key it and run a waterstop through it. Every pipe that passes through a wall gets a proper sleeve and a collar, because penetrations leak far more often than concrete does. Then the shell gets a full wet cure, hoses and burlap, a solid week of it. Fast curing means shrinkage cracks, and shrinkage cracks in a vessel mean a slow leak you'll chase for years.

Bare cured concrete holds water on its own when it's built this way. Plenty of owners still want a coating for color or for extra insurance, and that's a fine choice. What isn't fine is relying on a coating to fix a shell that was placed badly. A paint-on product bridges a hairline. It does nothing about a joint that was never detailed.

A year of upkeep on a Denver pond

Almost every leaking pond I have been called to look at was leaking at a pipe, a fitting, or a joint somebody poured cold and hoped about. The concrete itself is rarely the problem. Get the penetrations right and the rest of it is just a bowl.From the crew lead on these jobs