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Arapahoe County advances $40 million I‑70/Monahan interchange plan; proposes tiered impact fee
Summary
Arapahoe County staff presented plans and financing options for a redesigned I‑70/Airpark–Monahan interchange, proposing a tiered impact-fee that would place most construction costs on new development near the interchange but leaving a potential multi‑million-dollar shortfall if adjacent jurisdictions don’t participate.
Arapahoe County public-works staff briefed commissioners on a proposed redesign of the I‑70/Airpark–Monahan interchange and presented a financing proposal that would rely principally on a developer-funded construction bond reimbursed through a new county impact fee.
The project and the problem: County planners described an alignment to move the current interchange east along Monahan so the interchange can be widened, improve capacity and provide a safer crossing of the railroad tracks as development north of I‑70 proceeds. The preliminary construction estimate is $40 million for the phase south of I‑70; staff added an estimated $28 million in financing costs to produce a $68 million total planning figure.
How the county proposes to pay: Staff proposed an impact-fee district that would cover 6 square miles around the interchange and create two fee tiers. Tier 1 (zones closest to the interchange) would pay the largest share of the improvement. Using the county’s traffic forecasts and…
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