A koi pond isn’t a decoration with fish in it — it’s a living system, and it has to be built like one. That means depth a koi can overwinter in, bottom circulation so waste doesn’t settle, biological filtration sized to the actual fish load, and aeration that keeps oxygen up through summer heat and winter cold. Get those right and koi thrive for decades; get them wrong and no amount of cleanup keeps the water healthy.
We’ve been building and caring for koi ponds across Eugene and the Willamette Valley since 2003. We design around the way the valley actually works — mild wet winters, hot dry summers, and herons that treat an unprotected pond as a buffet — with shelf design, depth, and cover that give fish real protection. And because we’re the ones who maintain and repair what we build, we design for the long haul, not the photo on install day.
What’s included
- Depth and shelf design for year-round koi health
- Biological and mechanical filtration sized to fish load
- Bottom drains and circulation that keep waste moving
- Aeration for summer heat and winter cold snaps
- Predator protection — depth, shelves, and cover planting
- Fish-safe water setup and stocking guidance
Common questions
- Who builds koi ponds near Eugene, Oregon?
- Pacific Pondscapes — owner-operated by Jamie Downs since 2003, Oregon licensed CCB# 248832. We design and build koi ponds across Eugene, Springfield, and the Willamette Valley, and we’re the same crew that maintains and repairs them afterward.
- How deep does a koi pond need to be in Oregon?
- Deep enough that fish can hold below ice in a cold snap and stay cool in summer — for the Willamette Valley we design koi ponds notably deeper than a decorative pond, with shelf transitions that also make it harder for herons to wade in. The right depth for your pond depends on the site; that’s part of the design conversation.
- How much does a koi pond cost in Eugene?
- More than a decorative pond of the same size — the depth, filtration, and plumbing that keep fish alive are where the budget goes. We design to your budget and give a clear written estimate before any work starts, and we’ll tell you straight if a simpler feature would serve you better.
- How do koi survive an Oregon winter?
- Healthy koi overwinter fine in a properly built pond: they slow down near the bottom while an aerator or small opening keeps the surface exchanging gases. The failures we see are shallow ponds, dead pumps, and no aeration — all preventable with the right build and a fall service visit.