Historical structures
Photographs and research documenting Poly Canyon projects that are no longer standing.
- 32. Botanical Garden — The Botanical Garden, once a key feature of the area, was situated south of the canyon across the creek, separate from the main canyon itself. Established in 1955 by the Botany Department, the garden was designed to preserve native California plant species. While the garden is no longer extant, its historical significance and contribution to environmental education at Cal Poly are notable.
- 33. Suspension Bridge — The Suspension Bridge, an experimental senior project from 1961, was a bold attempt at combining innovative lightweight concrete techniques with practical architectural design. Located just south of the canyon boundaries, it spans a creek near the Botanical Garden. Predating the canyon and still standing today, the bridge is aged and no longer serves its original purpose, existing as a quiet relic of student ingenuity.
- 34. Hydraulic House — The Hydraulic House was a highly innovative architectural experiment conceived in the early 1970s. Centered around a 23-foot tall steel column filled with pressurized water, the structure explored the use of hydraulic forces as a primary load-bearing system. This pioneering design sought to combine ecological sustainability, prefabrication, and structural flexibility. Though the project also aimed to incorporate solar energy solutions, these elements were ultimately unsuccessful. Despite setbacks in construction and the inability to fully realize its environmental ambitions, the building’s experimental approach to architectural design remains a striking example of innovation in engineering and architecture.
- 35. Tree House — Built in 1967 by a Poly Royal crew, the tree house and accompanying gate were once situated near the entrance of the canyon, predating the stone archway. Originally designed as a playful, elevated platform among the sycamores, the structure’s charm faded over time. A 1982 repair list noted it needed preservative treatment, hinting at its gradual decay. By 1987, the tree house was missing its ladder, and a rare photograph captured its final years. Now vanished without a trace, it lingers in memory as a curious remnant of a bygone era, shrouded in mystery despite its once-prominent location.
- 36. Exercise Structure — The Exercise Station structures were developed as part of a broader vision to integrate physical fitness with the natural environment. Conceptualized in 1973 and refined in 1974, these stations featured equipment for exercises like pull-ups and sit-ups, blending recreation with fitness. However, the structures are now considered ghost projects—their exact locations are unknown, and no physical remains have been identified. They serve as a fascinating glimpse into experimental outdoor fitness design.
- 37. Tensegrity Mast — The Tensegrity Mast, constructed in 1975 by students under Jack Peterson’s guidance, was a striking structural experiment placed prominently on a knoll in the canyon. The mast’s history is marked by cycles of vandalism and repair, with wires cut and turnbuckles loosened during its early years, causing repeated collapses. Photographs show it lying horizontal before briefly being reassembled upright in 1978. By 1982, plans were made to rewire and move it back to its original location, but it was never fully restored. While the mast itself is long gone, its original foundations remain visible near the site of the Tensegrity structure, serving as a tangible reminder of its ambitious legacy.
- 38. Cor X — The Cor-X house, built in 1982, was a lightweight plastic structure with aluminum framing constructed by a Crop Sciences major and an Architecture major. Designed as a low-cost, portable housing experiment, the structure featured polystyrene insulation, an RV-style toilet, and a unique greenhouse-style front door. Its purpose was to promote sustainable housing solutions for disaster relief and developing countries. Though functional during its time, the house has since vanished, leaving its foundations near the modern-day Fratessa Tower as the only trace of its existence.
- 39. Accessory Shed — The Accessory Shed, completed in 2022, was an asymmetrical wooden shed designed to explore the undervalued architectural style of California’s Central Valley. Built with CDX plywood and featuring a pitched roof, raised heel truss, and overhanging eaves, the structure deliberately lacked windows or doors, drawing focus to its external design. Its imbalanced form and exaggerated proportions challenged traditional perceptions of utility buildings while providing shade and scenic views. Positioned near the top of the canyon, the structure had no accessible interior and no functional purpose, and it has since been removed.
- 40. Cow Fence — The Cow Fence, estimated to have been built in 1965, was an early structure designed to keep cows out of the area designated for projects at the time. Crafted from an array of vertical wooden posts, the gate combined functionality with a whimsical aesthetic. It's believed to have been near the current entrance to the canyon, slightly north of its current location. Intended to allow people to pass freely while serving as a barrier for livestock, little is known about the structure beyond a photograph found in George Hasslein’s scrapbook, which depicts him walking through the gate.
- 41. Compressed Earth Blocks — The Compressed Earth Blocks project, developed in 1965, was an effort by five architectural engineering students to explore sustainable construction methods using locally sourced materials. The team designed and tested dozens of compressed earth blocks (CEBs) for durability, load-bearing capacity, and fire resistance. Though initially part of a more ambitious plan, the focus on CEBs demonstrated the potential of low-cost, eco-friendly materials for future canyon projects.
- 42. Sculptural Windmill — The Windmill, a ghost structure documented through a single photograph, remains an enigma. Believed to have responded to changes in wind direction, its precise purpose and construction details are unknown, although its location has been deciphered from the photo. In 1982, there was a mention of possibly rebuilding or designing a new windmill, but no further information has surfaced. Its fleeting presence adds a layer of intrigue to the sculpture.