Rating:
9 votes

Siuslaw River Bridge

Photos 

Siuslaw River Bridge

Photo taken by Mike Goff in April 2012

Enlarge

BH Photo #230643

Map 

Street View 

Facts 

Overview
Bascule bridge over Siuslaw River on US 101 in Florence
Location
Florence, Lane County, Oregon
Status
Open to traffic
History
Built 1936; rehabilitated 1977, Rehabilitated 2010
Builders
- Arthur Jordan (Construction Supervisor)
- Conde B. McCullough of Redfield, North Dakota (Bridge Engineer)
- Hamilton Construction of Springfield, Oregon (Rehabilitation Contractor)
- Mercer-Fraser Co. (Contractor)
Design
North Approach – 8 spans of reinforced concrete deck girder totaling 478-feet
Main Spans – 140-foot double leaf Chicago style bascule lift with a single 154-foot reinforced concrete tied arch at each end of the bascule.
South Approach – 12 spans of reinforced concrete deck girder totaling 646-feet
Dimensions
Length of largest span: 154.0 ft.
Total length: 1,568.0 ft.
Deck width: 27.0 ft.
Vertical clearance above deck: 16.7 ft.
Recognition
Posted to the National Register of Historic Places on August 5, 2005
Also called
Florence Bridge
Approximate latitude, longitude
+43.96444, -124.10861   (decimal degrees)
43°57'52" N, 124°06'31" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/411064/4868521 (zone/easting/northing)
Quadrangle map:
Florence
Inventory numbers
NRHP 05000816 (National Register of Historic Places reference number)
OR 01821E (Oregon Dept. of Transportation structure number)
BH 30035 (Bridgehunter.com ID)
Inspection (as of 07/2015)
Deck condition rating: Fair (5 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 24.2 (out of 100)
Average daily traffic (as of 2014)
10,100

Update Log 

  • August 27, 2016: New Street View added by Douglas Butler
  • December 14, 2015: New Street View added by Douglas Butler
  • October 19, 2014: New photos from Royce and Bobette Haley
  • March 10, 2014: Photos imported by Dave King
  • April 25, 2012: New photos from Mike Goff
  • July 1, 2010: New photo from Michael Goff
  • April 22, 2010: New Street View added by Michael Goff
  • April 19, 2009: Posted HAER photos
  • December 15, 2008: New photo from Michael Goff
  • July 14, 2008: Updated by Michael Goff
  • July 7, 2008: Updated by Michael Goff

Related Bridges 

Sources 

Comments 

Siuslaw River Bridge
Posted July 28, 2017, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)

The Siuslaw River Bridge is being rehabilitated, concrete repairs with a cathodic protection system. Even with the containment it is a magnificent structure. I got to spend last night hanging under the bascule span and woke up to this view!

Siuslaw River Bridge
Posted August 27, 2013, by Darren Funk (dfunk1984 [at] gmail [dot] com)

The lift span deck and sidewalks were rehabilitated by Advanced American Diving Services in approx 2005, which included replacing the steel grating deck and with a FRP hollow core composite and overlaid with a polymer filled aggregate finish. The sidewalks were also replaced with fiber reinforced recycled plastic lumber. I was the Project Manager for AAC on that contract.

I believe the Hamilton rehabilitation was mostly mechanical/electrical upgrades and were definitely needed. The system was original construction in 2005 and in bad shape when we performed the lift span improvements.

Siuslaw River Bridge
Posted April 26, 2012, by Nathan Holth (form3 [at] historicbridges [dot] org)

James: Regarding movable types, my comments:

Abt bascules are not a subcategory of heel trunnions. "Abt trunnion bascule" would be correct. Also, to my knowledge all heel trunnions are Strauss Heel-trunnions. Not sure anyone else ever built them.

For rolling lifts, I would call them "Scherzer type rolling lift bascule" I add the word "type" to the name, because many are not directly associated with Scherzer RLBC or successors Hazelet and Erdal.

There should be a category for Strauss trunnion bascules. These are those Strauss bascules which have two trunnions, but are not heel trunnions.

There should be a category for Strauss direct-lift bridges (type of vertical lift). This category could be called more generically "direct lift" since C. L. Strobel also had a direct lift design, although I don't think any examples survive on this planet.

Swing bridges are classified with two different descriptor categories. One is the type of bearing, which you have listed (center or rim bearing). However they are also categorized by whether they are "center pier" (ie the truss is symmetrical) or bobtail, (asymmetrical, counterweighted at one end)

Siuslaw River Bridge
Posted April 26, 2012, by James Baughn (webmaster [at] bridgehunter [dot] com)

I'd like to expand the list of categories for movable bridges. Right now, when editing a bridge, there's a simple pulldown menu for vertical lift, bascule, swing, etc. I'm thinking of expanding the menu to include the additional sub-types below. Do I have these organized correctly? Am I missing anything?

BASCULE

...Fixed trunnion bascule

......Chicago-type fixed trunnion bascule

......Page fixed trunnion bascule

...Heel trunnion bascule

......Strauss heel trunnion bascule

......Abt heel trunnion bascule

...Rolling bascule

......Scherzer rolling lift bascule

......Rall roller bascule

VERTICAL LIFT

...Span drive vertical lift

...Tower drive vertical lift

SWING

...Center-bearing swing

...Rim-bearing swing

Siuslaw River Bridge
Posted April 25, 2012, by Nathan Holth (form3 [at] historicbridges [dot] org)

Mike:Thanks for confirming the bascule type.

All: I noticed there was not a fixed trunnion bascule category on BridgeHunter even though there are rolling lift and heel trunnion categories, so I added a fixed trunnion bascule category that people can use if they know the bascule type.

Siuslaw River Bridge
Posted April 25, 2012, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)

Nathan,

Your assessment of the bascule is correct. The bridge is in fact a fixed trunnion bascule. It was designed by the Oregon State Highway Department, under McCullough.

The configuration of the bascule truss is identical to the other OSHD designed bascule bridges of the era (Isthmus Slough, Lewis & Clark River & Old Young’s Bay).

MG

Siuslaw River Bridge
Posted April 25, 2012, by Nathan Holth (form3 [at] historicbridges [dot] org)

Based on photos and HAER documents, this appears to be a Chicago type fixed trunnion bascule. Anyone know any different?

Siuslaw River Bridge
Posted April 25, 2012, by Mike Goff (michael [dot] goff [at] hotmail [dot] com)

After what seemed like endless rehab/electrical projects, the Siuslaw River Bridge is finally scafoldless. I was finally able to get up close and get some decent photos. This is definitely one of Conde McCullough's finest designs. Three vastly different bridge types blend into a seamless beautiful structure.