Vibration-based　monitoring　was　performed　on　a　short-span　skewed　highway　bridge　on　the　basis　of　wireless　measurements.　By　means　of　operational　modal　analysis,　highly　accurate　modal　results　(frequencies　and　mode　shapes)　were　extracted　by　using　a　self-developed　wireless　acquisition　system,　for　which　the　performance　was　verified　in　the　field.　In　order　to　reproduce　the　experimental　modal　characteristics,　a　refined　finite　element　model　was　manually　tuned　to　reduce　the　idealization　errors　and　then　updated　with　the　sensitivity　method　to　reduce　the　parametric　errors.　It　was　found　that　to　build　a　reliable　Finite　element　(FE)　model　for　application　in　structural　health　monitoring,　the　effects　of　superelevation　and　boundary　conditions　of　a　skewed　bridge　should　be　taken　into　account　carefully.