Transportation department crews are set to begin constructing a new bicycle and pedestrian land bridge over state Route 520, which will connect the Washington Park Arboretum to Seattle’s University District. Beginning Monday, the temporary bicycle path under state Route 520 will be permanently closed to make room for construction. Bicyclists and pedestrians will need to use Montlake Boulevard to cross the highway. In July, crews will also permanently close the temporary Lake Washington Boulevard on-ramp to eastbound state Route 520 to continue construction.