Leavenworth to Sioux City
.

10-C&NW / BN Leavenworth
The Union Bridge Company constructed this swing span for the Leavenworth Terminal Railway and Bridge Company during 1893. This bridge was on the mainline of the Chicago Great Western, which used trackage rights on Missouri Pacific south
of Leavenworth to reach Kansas City. Other users of this crossing were the
Chicago, Burlington and Quincy and the Chicago, Rock Island and Pacific. CGW purchased the bridge during 1910, and retained ownership until absorbed by the Chicago and North Western in 1968. C&NW bought the superior CRI&P line to Kansas City during 1983, allowing the abandonment of this bridge in the mid 1980s. 
WikiMapia   Terraserver   Bridgehunter   Photos
Passenger- the CGW operated a Minneapolis-Kansas City passenger train over this bridge until 1962. 
Traffic- abandoned, and removed 
Bridge type- moveable, swing span
.

11-CRI&P Fort Leavenworth
The Chicago, Rock Island and Pacific Railroad bridge at Fort Leavenworth
opened in 1871, allowing entry into Leavenworth, Kansas. It was also used by the Chicago Great Western from 1890 until 1893, when the Terminal Bridge to the south opened. The bridge was rebuilt during 1926 to carry US Highway 92, which it did until replaced by Centenial Bridge in 1955. 
WikiMapia   Terraserver   Website
Traffic- abandoned
Bridge type- ? 
.

12-BNSF Atchison
This crossing dates from 1875, and was used by Chicago, Burlington and Quincy and the Chicago, Rock Island and Pacific. The Atchison, Topeka and Santa Fe gained trackage rights over the bridge to replace their abandoned route to St. Joseph during the 1970s, and acquired part of the CRI&P line after the Rock's demise. The CB&Q was merged into Burlington Northern during 1970, which merged with the ATSF in 1996 to form the current operator of this bridge, BNSF Railway.
WikiMapia   Terraserver   Bridgehunter   Photo
Traffic- light (less than 5 GMT) 
Bridge type- moveable, swing span
.

13-UP St. Joseph
From the Missouri History Website-
The St. Joseph Bridge Building Company was incorporated in 1870. The bridge cost $716,000, to which St. Joseph subscribed $500,000. The structure was begun July 25, 1871, and by the 20th of May, 1873, the first locomotive was run over it by Edward Steppy, master mechanic of the St. Joseph & Denver City Railroad. The bridge consisted of six piers, to build which caissons were sunk to bed rock. The masonry proceeded upward as the caisson were sunk under pneumatic pressure. To build the caisson required 1,500,000 feet of lumber and 16,000 cubic feet of concrete. The piers contain 172,000 cubic feet of masonry. The superstructure consists of three fixed spans of the quadrangular Pratt truss, each 300 feet long, one fixed span eighty feet long at the east end, and a draw span 3654 feet long, making the entire length of the bridge 1,345 feet. On June 16, 1879 the control of the bridge was transferred to Jay Gould and associates.
Ownership of the bridge went to Union Pacific's St. Joseph & Grand Island Railroad. The Atchison, Topeka and Santa Fe gained trackage rights over the bridge, as did the Chicago, Rock Island and Pacific. Union Pacific sold the 108 mile line from St. Joseph to Upland, KS during February 1990 to Railtex, and this became the Northeast Kansas and Missouri. The line was repurchased in 1998, as Union Pacific needed the route between Hiawatha and Upland in Kansas for empty coal trains returning to the Powder River Basin. The bridge is now part of a Union Pacific 4 mile long spur line from St. Joseph to Elwood, KS. 
WikiMapia   Terraserver
Traffic- light (less than 5 GMT) 
Bridge type- moveable, swing span
.

14-BNSF Rulo
The Chicago, Burlington and Quincy opened the bridge at Rulo during 1887, connecting the traffic hubs of Kansas City and Lincoln, Nebraska. The majority of the original bridge, including both of the 375' main spans, was replaced during July 1977. At present the bridge is heavily used by BNSF Railway for eastbound coal out of Wyoming.
WikiMapia   Terraserver   Wikipedia 
Traffic- heavy (100+ GMT) 
Bridge type- fixed
.

15-BN Nebraska City
Following the completion of the Plattsburg Bridge (1882) 25 miles to the north, and the Rulo Bridge (1887) 50 miles down river, a near duplicate was built by the 
Chicago, Burlington and Quincy during 1888 east of Nebraska City. All three bridges used a pair of through trusses to cross the main river channel. Before 1888, a temporary Pontoon Bridge had been used crossing the river. The CB&Q was merged into Burlington Northern on March 2, 1970. These three bridges required upgrading for the heavier trains of the 1980s, and the Nebraska City bridge was deemed surplus and abandoned during 1982. On December 15, 1984, the bridge was blown up in a controlled demolition and removed. 
WikiMapia   Terraserver   Photos 
Traffic- abandoned, and removed 
Bridge type- fixed
.

16-BNSF Plattsmouth
The Burlington and Missouri River Railroad, which was at the time backed by the Chicago, Burlington and Quincy, reached the Missouri River across from Plattsmouth during 1869. A subsidiary, the Burlington and Missouri River Railroad in Nebraska, began building west from Plattsmouth. CB&Q leased the pair of railroads in 1872, and Denver was reached 1882. That year also saw the construction of a bridge over the Missouri at Plattsmouth. The original bridge was constructed with two through trusses. Replacement came during 1902, to a bridge with a single 402' through truss. Burlington Northern replaced the west end of the bridge in 1976 when they straightened the alignment to eliminate a 12 degree curve on the Nebraska side. This crossing is heavily used as part of the BNSF Railway line between Lincoln and Chicago.
WikiMapia   Terraserver    Photos
Passenger- Amtrak's California Zephyr crosses over the Missouri on this bridge. 
Traffic- heavy (about 104 GMT) 
Bridge type- fixed
.

17-UP Omaha
The first Union Pacific bridge between Omaha and Council Bluffs opened during 1872, in some respects completing the Transcontinental Railroad. An increase in traffic led to replacement of the span with a double track bridge during 1887. This is turn was replaced by the present bridge during 1917. Union Pacific now operates mostly eastward traffic over the bridge, while westbound traffic is concentrated on the former C&NW Blair bridge to the north. The Chicago, Rock Island and Pacific had trackage rights over this line until 1980, and BNSF Railway currently operates over it on trackage rights.
WikiMapia   Terraserver   Wikipedia   Photos   Photo   Photo   Photo   Photo   Photo   Photo 
Passenger- Amtrak's San Francisco Zephyr crossed over the Missouri on this bridge until April 25, 1982 
Traffic- heavy (about 143 GMT) 
Bridge type- fixed
.

18-CN Omaha
Illinois Central bridged the Missouri to reach Omaha during 1903, through subsidiary Omaha Bridge & Terminal Railway. The swing span turning mechanism was destroyed in 1988, and the bridge is left open during Navigation season. Canadian National acquired Illinois Central in 1998, and rarely uses this bridge.
WikiMapia   Terraserver   Photo   Website
Traffic- light (less than 5 GMT) 
Bridge type- moveable, swing span
.

19-UP Blair
The first permanent bridge over the Missouri River near Blair was completed in October 1883, and consisted of 3 330-foot Whipple trusses. These Whipple Truss spans were replaced during 1923 by the Chicago and North Western Railway, with the 3 Parker Trusses which are still in use. Union Pacific merged the C&NW during 1995, and the Blair Bridge is now paired with the Omaha bridge, handling mostly westbound traffic.
WikiMapia   Terraserver   Photo   Photo   Website   Photos
Traffic- heavy (about 91 GMT) 
Bridge type- fixed
.

20-C&NW Sioux City  
Sioux City and Nebraska were linked during December 1888, with a bridge built for the Chicago, St. Paul, Minneapolis and Omaha Railroad. The CStPM&O, under the control of the Chicago and North Western Railway, was building a line between St. Paul and Omaha. The Great Northern Railway was the second railroad to begin using the bridge. GN acquired 230 miles of line in Nebraska, which were transfered after 1900 to subsidiary Chicago, Burlington and Quincy, which became the third railroad using the bridge. By the early 1980s, C&NW owned the bridge, with GN and CB&Q's trackage rights held by Burlington Northern. Useage by the North Western had fallen, as this was no longer a through route for them. BN was now the main user of the bridge, particularly in grain traffic. After the passage of almost one hundred years,
replacement was required to carry the heavier traffic.
WikiMapia   Terraserver   Website
Traffic- abandoned, and removed
Bridge type- ?
.

21-BNSF Sioux City
The current bridge spanning the Missouri at Sioux City was constructed by the Burlington Northern Railroad around 1982. Trackage rights over the bridge were granted to the Chicago and North Western Railway, as their bridge was removed. Ownership is now in the hands of BNSF Railway, while C&NW's rights are used by Union Pacific.
WikiMapia   Terraserver 
Traffic- medium (about 28 GMT) 
Bridge type- fixed
.

x-Sioux City Combination Bridge
The second permanent bridge across the Missouri River at Sioux Falls opened in 1896. Constructed for foot, horse and light rail traffic and later automobiles, it was nicknamed the Combination Bridge because it carried various forms of traffic. It may have seen use by the Great Northern Railway during the 1890s. Replacement came during 1981 by the new Veterans Memorial Bridge, due to structural issues.
WikiMapia   Terraserver   Website   Photos   Demolition
Traffic- never used (?), removed
Bridge type- moveable, swing span

Jefferson River Crossings
The Missouri River begins in Three Forks, Montana, where the Jefferson and Madison Rivers join. The third fork is the Gallatin River, which meets the Missouri a short distance downriver. The Jefferson River is 207 miles long, beginning at Twin Bridges, MT, where the Big Hole and Beaverhead Rivers join.
The Northern Pacific and the Chicago, Milwaukee, St. Paul and Pacific Railroads each built 2 bridges over the Jefferson. Both of the NP bridges remain in use.

1-CMSP&P Three Forks
The mainline of the Milwaukee Road crossed the Jefferson River twice, and was in service from 1909 until it was abandoned during March 1980.
WikiMapia   Terraserver
Passenger- a truncated remnant of the Olympian Hiawatha operated over this bridge until January 1964. 
Traffic- abandoned 
Bridge type- fixed

2-MRL Sappington
After the Northern Pacific completed their mainline through Helena, a second line across the Continental Divide was opened during 1888 to serve Butte. Burlington Northern continued to operate the line after 1980 until it was mothballed during 1983. Montana Rail Link currently uses this bridge and runs west from here to Spire Rock, on the east slope of Homestake Pass. It is possible the line could reopen to Butte.
WikiMapia   Terraserver
Passenger- Amtrak's North Coast Hiawatha ran over this line until October 7, 1979.
Traffic- light (less than 5 GMT) 
Bridge type- fixed

3-CMSP&P Jefferson Island
The second crossing of the Jefferson River by the electrified CMSP&P mainline was just west of Jefferson Island, Montana. June 1974 saw the end of the electric operations, and March 1980 saw the abandonment of the line.
WikiMapia   Terraserver
Passenger- a truncated remnant of the Olympian Hiawatha operated over this bridge until January 1964.
Traffic- abandoned 
Bridge type- fixed

4-MRL Waterloo
Northern Pacific reached Alder, Montana, with a line leaving the Homestake Pass route at Whitehall. This branch line is now owned by MRL, who operate it as far as Twin Bridges, crossing the Jefferson River near Waterloo, Montana.
WikiMapia   Terraserver
Traffic- light (less than 5 GMT) 
Bridge type- fixed
. 

Madison River Crossings
The Madison River begins in Yellowstone National Park, Wyoming. It runs 183 miles to Three Forks, Montana, where it joins the Jefferson River.
Two railroad crossings over the river were built, by the Chicago, Milwaukee, St. Paul and Pacific and the Northern Pacific. The Northern Pacific bridge survives, now used by Montana Rail Link.

1-CMSP&P Bridge
The Milwaukee Road served the Gallatin Valley with a branchline which left the mainline at Three Forks, and crossed the Madison River just east of town, just north of the Northern Pacific bridge. This CMSP&P branch was abandoned during 1980.
WikiMapia   Terraserver
Traffic- abandoned and removed 
Bridge type- fixed

2-MRL Bridge
This bridge lies on Montana Rail Link's 5th subdivision, which runs between Logan and Twin Bridges. Originally it was part of Northern Pacific's secondary mainline through Butte.
WikiMapia   Terraserver
Passenger- Amtrak's North Coast Hiawatha ran over this line until October 7, 1979.
Traffic- light (less than 5 GMT) 
Bridge type- fixed
.    

Gallatin River Crossings
The third 'parent' of the Missouri is the Gallatin. The Gallatin River is 120 miles in length, and begins in Park county, Wyoming.
Five crossings were built over the river, three by the Northern Pacific Railway and two by the Chicago, Milwaukee, St. Paul and Pacific. Two remain in service, both of them former NP bridges operated by Montana Rail Link.

1-MRL Logan
The Northern Pacific split at Logan, with the mainline crossing the river heading for Mullan Pass and Helena. The second route stayed on the south bank of the Gallatin, crossed Homestake Pass and went through Butte. Burlington Northern closed the Homestake Pass line, and today Montana Rail Link uses the Mullan Pass line for through traffic. 
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Passenger- Burlington Northern's Mainstreeter ran over this line until May 1971, and the Montana Daylight operated through here from 1994 until 2004.
Traffic- medium (20 to 40 GMT)
Bridge type- fixed

2-NP Low Grade Line
Northern Pacific's line climbing the western slope of Bozeman Pass was operating near capacity, resulting in the construction a low grade line between Logan and Bozeman. This line was completed on November 16, 1919, and remained in operation until the end of December 1956. 
WikiMapia    TerraServer    Website
Traffic- abandoned and removed
Bridge type- fixed

3-MRL Mainline
Montana Rail Link's second bridge over the Gallatin is nestled between the Interstate and old highway bridges. This was part of Northern Pacific's mainline running across the Treasure State.
WikiMapia    TerraServer
Passenger- Amtrak's North Coast Hiawatha ran over this line until October 7, 1979, and the Montana Daylight operated through here from 1994 until 2004.
Traffic- medium (20 to 40 GMT)
Bridge type- fixed

4-CMSP&P Belgrade Branch
The town of Belgrade, Montana, was reached by the Chicago, Milwaukee, St. Paul and Pacific Railroad through a 5 mile brach line which came off of their Bozeman branch. The line, and this bridge, were abandoned during 1962.
WikiMapia    TerraServer
Traffic- abandoned and removed
Bridge type- fixed

5-CMSP&P Bozeman Branch
The Milwaukee Road served Bozeman with a branch line beginning on the mainline at Three Forks. This line operated from 1918 until March 1980. On the east side of the bridge over the Gallatin was Bozeman Hot Springs. From there a short branch headed south to Gallatin Gateway, the CMSP&P's access to Yellowstone National Park.
WikiMapia    TerraServer
Traffic- abandoned and removed
Bridge type- fixed

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Dale's Trackside Guides

#1-Mississippi River Crossings
This is a study of the Railroad crossings over the Mississippi River.

#2-Amtrak's Current Routes
A detailed accounting of which railroad owns every mile of track used by Amtrak.

#3-Class 1 Railroads in the 1950s 
A summary of the 127 class 1 railroads in 1950.

#4-The Milwaukee Road Mainline
Points of interest on the CMSP&P mainline from Chicago to Seattle and Portland.

#5-Montana Rail Link, I&MRL and IC&E Rosters 

#6-GP30 Ownership
A simple rundown of the dozens of owners of GP30 locomotives.

#7-Amtrak's Original Routes
A look at the routes used by Amtrak on May 1st, 1971.

#8-Continental Divide Crossings
A summary of the railroad crossings of the Continental Divide in North America

#9-Iowa's Counties
A listing of the railroads operating in Iowa's 99 Counties today and in
1985 and 1930.

#10-America's Regional Railroads
A look at the 62 current and former Regional Railroads in the United States

#11-AC Ownership
Owners of locomotives with AC traction motors

#12-Ohio's Counties
A listing of the railroads operating in Ohio's 88 Counties today and in
1985 and 1930.

#13-1980
A look at the events that took place during 1980 affecting America's railroads.

#14-Pieces of the Rock
Surviving rail lines and locomotives of the Rock Island Railroad.

#15-Amtrak's Abandoned Routes
A State by State list of routes previously used by Amtrak.

#16-Missouri River Crossings
A study of the Railroad crossings over the Missouri River.

Dale's Nexus

Hi Brian,

I thought it only fair that I cover the bridges on 'Iowa's west coast' as well.

Less to work with, and less ethusiasm on my part, so this will take awhile.