Boise public works crews have taken swift action to close a natural cave that had become a popular, but unsafe, campsite along the Boise River Greenbelt near the Arid Club. The city installed temporary concrete blocks to block entry and is moving forward with a larger riverbank restoration plan aimed at preventing erosion when river flows rise.
Safety concerns prompt immediate closure
Police officers reported that the cave was frequently used by campers, leaving behind trash and other debris. City engineer Jim Pardy said the discovery raised safety concerns for the many pedestrians and cyclists who use the Greenbelt daily. “When it was brought to our attention, we came out and there was kind of a roof to it,” Pardy explained. Crews removed the roof‑like formation and placed concrete blocks to keep people from re‑entering the space.
Local Greenbelt user Avery Tuininga expressed relief at the action, noting that the hidden cave had been unsettling. “I didn’t know that was there, so it’s kind of freaky to hear that it was a thing and kind of makes me ick a little bit to know that,” she said.
Long‑term erosion mitigation plan
While the immediate blockage addresses public safety, engineers warned that the site could become vulnerable during high water events. “When flows rise, water could reach the opening and wear away the bank,” Pardy said. He described a scenario in which a small 10‑by‑30‑foot area could erode, potentially extending damage down the Greenbelt.
To counter this risk, the city plans to reshape the riverbank to match the surrounding terrain, add rock armoring, and plant willow trees to stabilize the soil. “My guess is after a couple of years of restoration you won’t even know this was here and it’ll just blend into the landscape,” Pardy added.
The project will require the removal of four existing trees, which will be replaced with twelve new willows and other native vegetation. The city expects to begin work this winter, funding the effort through its “Enhance the River” program. Pardy anticipates the restoration will take no more than a few weeks once construction starts.
Impact on Greenbelt users
During the restoration, temporary flaggers will manage equipment crossings to minimize disruption for walkers and cyclists. “It feels good to know they care and like to help you feel safer in a place because I know it’s a widely used thing,” Tuininga said.
Pardy also noted that the improvements will help protect the Greenbelt from future flooding events, including the anticipated “Snowmageddon” storms that Idaho often experiences. “We won’t have to worry about this area. It will be nice and secured,” he said.
The Boise City Council will review the final design and budget at its next meeting, ensuring community input remains part of the process. Residents are encouraged to share feedback through the city’s online portal or at upcoming public hearings.
Looking ahead
Boise’s proactive approach to this hidden cave reflects a broader commitment to maintaining safe, accessible public spaces while preserving the natural beauty of the river corridor. By addressing both immediate safety concerns and long‑term erosion risks, the city aims to keep the Greenbelt a vibrant, family‑friendly asset for years to come.
Original reporting: KIVI Idaho News 6 Boise metro (local) — read the source article.
