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Brown County commissioners weigh experimental "balloon" bridge method to cut costs
Summary
Brown County commissioners discussed a preliminary proposal to use inflatable formwork for bridge superstructures that the vendor says could lower per-bridge costs. Commissioners asked engineers to review the concept and to consult KDOT before any purchase or pilot.
The Brown County Commission discussed a proposal from a vendor that uses inflatable formwork — described in the meeting as a "balloon" method — to build bridge superstructures, with commissioners agreeing to seek engineer and Kansas Department of Transportation (KDOT) review before any procurement.
County Counselor said the vendor estimated a 10-bridge program at about $500,000 total (roughly $50,000 of materials per bridge) and proposed a staged payment structure including a $30,000 upfront design deposit and additional per-bridge payments. "They think they can construct it at 125,000, which is a probably about a 25% market savings," the County Counselor reported during the meeting.
The commission emphasized that the proposal was preliminary. Commissioner Bill pressed for verification that a U.S. engineer would stamp the plans and whether KDOT would approve the means and methods for bridges in Brown County. Commissioners repeatedly flagged footing and site-compatibility concerns — noting that existing footings at each bridge must be evaluated to determine whether the method could be used at particular locations.
Commissioner Austin said the next step was to have the county's consulting engineer and a KDOT engineer review the vendor's design and make a "go/no-go" recommendation. "If they come back and say yes, then the next step is have them come out and look at it," Austin said. The commission discussed the possibility of piloting two bridges: if the county was dissatisfied after the first uses, the vendor had offered to take the equipment back under the proposed terms.
Commissioners also compared the proposal against county self-performance and conventional methods. Some members questioned whether the county could self-perform bridges at comparable cost once equipment and labor were considered; others noted the method could reduce the county's recurring backlog of small bridge repairs.
The commission did not authorize any purchase. They directed staff to request a formal review from a KDOT engineer and to arrange a site visit and engineering sign-off to determine feasibility and per-site cost estimates. No timeline for that review was committed at the meeting.
