Salmon Bay Bridge

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Salmon Bay Bridge
SalmonBayBridge.JPG
Salmon Bay Bridge seen from the southeast
Coordinates 47°40′00″N122°24′08″W / 47.66680°N 122.40213°W / 47.66680; -122.40213
CarriesBNSF Scenic Subdivision
CrossesSalmon Bay
Other name(s)Bridge No. 4 (GN), Bridge 6.3 (BNSF)
Characteristics
Design Bascule
MaterialSteel
Total length1,140 ft (350 m) [1]
Width26 ft (7.9 m) [1]
Clearance above 43 ft (13 m) [2]
Rail characteristics
No. of tracks 2 [1]
History
Opened1914
Statistics
Daily traffic 30-40 trains per day [3]
Location
Salmon Bay Bridge

The Salmon Bay Bridge, also known as Bridge 6.3 on the BNSF railroad, [4] formerly Bridge No. 4 on the Great Northern Railroad, [5] is a Strauss Heel-trunnion single-leaf bascule bridge spanning across Salmon Bay and connecting Magnolia/Interbay to Ballard in Seattle, Washington. The bridge is located just west of Commodore Park. It carries the main line of the BNSF Railway, the Scenic Subdivision, on its way north to Everett and south to King Street Station and Seattle's Industrial District.

The Salmon Bay Bridge, which is located west of the Hiram M. Chittenden Locks, is the last bridge to span the Lake Washington Ship Canal before it becomes Puget Sound. Built in 1914 by the Great Northern Railway, it has an opening span of 61 meters (200 feet) and has two tracks. Additionally, vessel clearance when lowered is 13.1 meters (43 feet) at mean high tide, [2] and up to 15.3 meters (50 feet) at low tide. [5]

BNSF Railway initially planned to replace the Salmon Bay Bridge with a new vertical-lift bridge, but chose to repair failing components of the existing bridge following consultation with the local community. [6] [3]

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<span class="mw-page-title-main">Lake Washington Ship Canal</span> Waterway in Seattle, Washington, United States

The Lake Washington Ship Canal, which runs through the city of Seattle, connects the fresh water body of Lake Washington with the salt water inland sea of Puget Sound. The Hiram M. Chittenden Locks accommodate the approximately 20-foot (6.1 m) difference in water level between Lake Washington and the sound. The canal runs east–west and connects Union Bay, the Montlake Cut, Portage Bay, Lake Union, the Fremont Cut, Salmon Bay, and Shilshole Bay, which is part of the sound.

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Salmon Bay is a portion of the Lake Washington Ship Canal, which passes through the city of Seattle, linking Lake Washington to Puget Sound, lying west of the Fremont Cut. It is the westernmost section of the canal and empties into Puget Sound's Shilshole Bay. Because of the Hiram M. Chittenden Locks, the smaller, western half of the bay is salt water, and the eastern half is fresh water. Before the construction of the Ship Canal, Salmon Bay was entirely salt water.

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Interbay is a neighborhood in Seattle, Washington consisting of the valley between Queen Anne Hill on the east and Magnolia on the west, plus filled-in areas of Smith Cove and Salmon Bay. The neighborhood is bounded on the north by Salmon Bay, part of the Lake Washington Ship Canal, across which is Ballard; on the south by what remains of Smith Cove, an inlet of Elliott Bay; on the east by 15th Avenue W. and Elliott Avenue W.; and on the west by the BNSF Railway. The Ballard Bridge crosses the ship canal from Interbay to Ballard.

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References

  1. 1 2 3 Sherrard, Jean (December 22, 2012). "Seattle now & then: Ballard's bascule bridge" . Retrieved January 1, 2024.
  2. 1 2 "Bridge-Navigation". hstrial-troychilds.homestead.com. Retrieved 2018-10-29.
  3. 1 2 Banel, Feliks (November 11, 2020). "Salmon Bay bridge operator keeps railroad tradition alive". MyNorthwest. Retrieved December 1, 2020.
  4. "BNSF Ballard Bridge 6.3 Trunnion & Bearing Replacement" . Retrieved 2023-12-15.
  5. 1 2 "Bridge 4". www.gngoat.org. Retrieved 2018-10-29.
  6. Lester, David C. (October 16, 2020). "BNSF chooses to repair, not replace, Salmon Bay Bridge". Railway Track & Structures . Retrieved December 1, 2020.