The Dunn Memorial Bridge, officially known and dedicated as the Private Parker F. Dunn Memorial Bridge, carries U.S. Route 9 (US 9), and U.S. Route 20 (US 20), across the upper Hudson River between Albany, New York and Rensselaer, New York.

Third highway / road bridge crossing the upper Hudson River at this site since 1882, 1933 and currently 1969. Current span cnstructed 1967-1969 and completed in 1969 to replace earlier parallel smaller / narrower span with an extensive steel girder superstructure framework above the roadbed, built 1931-1933, with a center section which opened to allow passing barges and boats to pass through, was dedicated bearing the same name,and memory of PFC Parker F. Dunn {1890-1918).

An earlier crossing of the Hudson at this same site was constructed in 1882, also of steel girders but with older technology of additional wrought iron superstructure trusses above the roadbed and the wood plank roadbed for horse-drawn carriages, wagons and single horse-back or pedestrian traffic stretching level straight across the tops and resting / bolted on several supporting stone piers. Known as the old Albany-Greenbush Bridge, it existed from about 1882 to 1933,

Historical black & white photographs of all three bridges spanning the upper Hudson are scanned from the library / archives ("morgue") on the internet website of the longtime local daily newspaper Albany Times Union in Albany, New York

The current 1969 arching highway bridge has a steel girder design supporting underneath the roadbed deck, resting / bolted onto the tops of reinforced steel bars framework imbedded in poured concrete piers anchored in the riverbed bottom. The bridge superstructure road deck arches up high enough off the normal river water surface to allow passing river boat / barge traffic without a center-section opening span piece. It is the southernmost toll-free road crossing of the upperHudson River

Both two of the most recent Hudson River spans of 1933 and 1969, were named and dedicated for Private first class Parker F. Dunn (August 1890-October 1918), of the United States Army, an Albany native who was posthumously awarded the congressional Medal of Honor for his service, bravery and sacrifice in the First World War.(1914/1917-1918), killed in the last year and last weeks of the four-years long "Great War" on the Western Front in northern France of Europe fighting the invading / attacking Imperial German Army of the German Empire (Germany). He was unfortunately killed in an incident that would cause him to be posthumously awarded the Nation's highest and rarest military decoration only two weeks before the peace / truce signed in the famous railway car in the Forest of Compiegne of France, between the western Allies and the enemy Central Powers of the Armistice of 11 November 1918.

The 1882 Albany-Greenbush Bridge also parallel and the later 1931-1933 old bridge which was the first of two to carry Private Dunn's name was kept up for a few years after its 1960s successor opened, but was eventually demolished (and many steel girders recycled) by 1971.

While traveling eastbound on the Dunn Memorial Bridge towards the City of Rensselaer, New York, there is a noticeable stub where the road ends and traffic is "forced off" the bridge onto off-ramps for U.S. Route 9 and U.S. Route 20. The road was originally supposed to continue on as part of the canceled South Mall Expressway to Interstate 90 at the present-day Exit 8.

Rensselaer's Riverfront Park is located under the eastern end of the Dunn Memorial Bridge. Wildlife of Peregrine falcons have been observed nesting under the roadway since about 1998, and the New York State Department of Environmental Conservation set up a webcam (video / television monitoring camera system) to broadcast its signal on the internet, to monitor and protect them.

On July 27, 2005, the bridge was temporarily closed when a ramp leading to the Empire State Plaza split vertically, causing the roadbed to drop more than a foot. A section of the ramp, which at 89 feet (27 m) tall is the uppermost one connecting to the bridge, had slipped and come to rest on a concrete supporting pier. The Department of Transportation was alerted to the situation by a call from a commuter who had driven over the gap. Two steel towers were installed to support the ramp and it was later repaired.

An unfortunate incident occurred on March 25, 2014, a man jumped off the bridge following a police chase in connection with a shooting the previous night. The man survived and was evacuated via ambulance.

Bicyclists and pedestrians may use the sidewalk along the north side of the bridge.

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  The Greenbush Bridge, seen in the background of this image, preceded the Dunn Memorial Bridge.
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  The stubs at the bridge's eastern end, built for the canceled South Mall Expressway.
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  A cross section of the unfinished eastern portion of one of the sides of the Dunn Memorial Bridge.
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  Supports for the unfinished end of the Dunn Memorial Bridge.
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  Surface and structure of the unfinished end of the Dunn Memorial Bridge.
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  The Dunn Memorial Bridge from the unfinished Rensselaer, NY side heading to Albany, NY.
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• New York (state) portal
• Transport portal
• Engineering portal
• List of fixed crossings of the Hudson River

• Media related to Dunn Memorial Bridge at Wikimedia Commons
• Dunn Memorial Bridge at Capital Highways
• Dunn Memorial Bridge at Everything2
• "Historical black & white photos / views: Pfc. Parker F. Dunn Memorial Bridge of 1967-1969, and earlier parallel first Dunn Memorial Bridge 1931-1933 to 1971, along with previous (also parallel) old Albany-Greenbush Bridge of 1882-1933, over the upper Hudson River between Albany and Rensselaer, New York". Albany Times Union. 2016-05-17. Retrieved 2021-09-01.

• Peregrine Falcons in Albany Archived 2006-10-09 at the Wayback Machine
• YouTube video of driving over the bridge
• Parker F. Dunn Medal of Honor Citation