City officials opened a new bike and pedestrian bridge over Interstate 80 in South Natomas on Saturday morning. Backers say the bridge, whose south base is adjacent to Gateway Oaks Drive, will make it easier for cyclists to get to and from downtown. The $6 million project includes a two-block-long bridge over the freeway as well as a second bridge at ground level over the nearby West Drainage Canal. The project was largely funded from federal grants, supplemented by state and local gas and sales tax funds. Both bridges add to the Sacramento area's existing bike trail system. The League of American Bicyclists last month gave Sacramento "silver" status as a bicycle-friendly city, an upgrade from its previous "bronze" designation. Nearby Davis is one of only three cities in the country with a "platinum" status, the league's highest designation.