Knik Arm Bridge, Bridge project location in Anchorage, United States

The Knik Arm Bridge is a dormant proposal for a 1.74-mile (2.80 km) crossing of Cook Inlet's Knik Arm, linking Anchorage with the Matanuska-Susitna Borough. The scheme pairs the span with 18 miles (29 km) of connector roads, ramps and a $50 million cut-and-cover tunnel under Government Hill; cost estimates run from $700 to $800 million.

Railroad engineers proposed bridging the Knik Arm as early as 1923 to create a route toward Alaska's interior regions. The concept remained under study for many decades before gaining official federal approval in more recent times, though funding obstacles have prevented construction.

The name Knik Arm Bridge has framed a century of debate in Anchorage: railroad engineers floated a crossing in 1923, and in 2003 the Alaska Legislature created KABATA to design, finance and operate it. Government Hill residents oppose options that would bisect their neighbourhood, while critics call the project pork-barrel because it was tied to the Gravina Island Bridge in funding legislation.

No bridge exists at the site, so there is no structure to walk across or view; the 1.74-mile span and 18 miles of connector roads remain unbuilt. Drivers between Anchorage and the Matanuska-Susitna Borough still rely on the Glenn and Parks Highways, the single road link the project was meant to supplement.

The project design included plans for a tunnel beneath Government Hill to address geographical constraints across the inlet. This added engineering complexity meant that costs extended well beyond the bridge span itself.