Agate Pass Bridge

{{Use mdy dates|date=March 2025}}

{{Infobox bridge

| bridge_name = Agate Pass Bridge

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| image = Agate pass1.jpg

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| carries = {{jct|state=WA|WA|305}}

| crosses = Agate Pass

| locale = Suquamish, Washington

| owner = WSDOT

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| design = Steel cantilever truss

| material = Steel

| length = 1,229 feet (375 m)

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| mainspan = 300 feet (91 m)

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| below = 75 feet (23 m)

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| complete = 1950

| cost = $1,351,363

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| toll = until October 1, 1951

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| heritage = NRHP

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{{Infobox NRHP

| embed = yes

| name = Agate Pass Bridge

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| image = Agate pass2.jpg

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| location = WA 305 over Agate Passage

| nearest_city = Suquamish, Washington

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| built = 1950

| architect = State Dept of Hwys

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| added = May 24, 1995

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| refnum = 95000625

| mpsub = Bridges of Washington State MPS

}} }}

The Agate Pass Bridge is a structural steel truss cantilever bridge spanning Agate Pass, connecting Bainbridge Island to the Kitsap Peninsula. It was built in 1950, and it replaced a car ferry service which dated from the 1920s.{{cite book |last1=Kline |first1=Mary |last2=Bayless |first2=George |author-link= |date=1983 |title=Ferryboats: legend on Puget Sound |location=Seattle |publisher=Bayless Books |page=140 |isbn=0-914515-00-4}} The bridge provides a direct route along Washington State Route 305 between Seattle, via the Seattle-Bainbridge Island ferry, and the Kitsap Peninsula.

The Agate Pass Bridge is {{convert|1229|ft|m}} long and is {{convert|75|ft|m}} above the water and has a channel clearance of {{convert|300|ft|m}} between piers.{{cite web|url=https://www.historylink.org/File/7136|title=Agate Pass Bridge connecting the north end of Bainbridge Island to mainland Kitsap County opens on October 7, 1950.|author=Paula Becker|publisher=THE FREE ENCYCLOPEDIA OF WASHINGTON STATE HISTORY|access-date=December 18, 2017}}

The original construction cost of $1,351,363 was paid out of the motor vehicle fund, and operated as a toll bridge from October 7, 1950, until October 1, 1951, when costs were repaid by a bond issue passed by the Washington State Legislature. The Washington Toll Bridge Authority managed the bridge during the year it took to repay the bond.{{cite web|url=https://www.atg.wa.gov/ago-opinions/highways-improper-expenditure-highway-funds|title=HIGHWAYS ‑- IMPROPER EXPENDITURE OF HIGHWAY FUNDS|author=JOHN J. O'CONNELL, DOUGLAS HARTWICH|publisher=Washington State: Office of the Attorney General|access-date=December 18, 2017}}

The Agate Pass Bridge is listed on the National Register of Historic Places.