The state is suggesting another tactic in financing the Knik Arm Crossing. Plans for a bridge linking Anchorage and the Matanuska Susitna Borough hit a snag earlier this year, when the state legislature reacted negatively to an audit indicating that toll projections for the first years after the bridge’s completion are too “optimistic.” State lawmakers had also failed to approve the creation of a state reserve to cover shortfalls in the toll revenues that project supporters say will pay for bridge construction.