A Photo Tour of the Rockville Bridge
Approaching on Bridge Road from the north.
Looking down at where the northwest corner of the bridge sets into the concrete abutment.
A side view of the northwest end of the bridge. The guardrail is a lattice build from steel angles and bars that are riveted together. The roadbed is a layer of asphalt spread over corregated steel. This replaced the original wooden deck and adds a lot of weight to the bridge.
Looking up at the northeast corner of the bridge. The large steel pieces are box beams that make up the upper chord of the bridge structure. The vertical post connects to a crossbeam under the bridge deck that supports the stringers that support the roadway. The smaller steel pieces are cross braces. The wire is for providing electrical power for the Christmas lights that are put up on the bridge every year.
A view down the length of the bridge from near the north end. It looks like the guard rail has taken a little hit at some time in the past. The conduit pipe on the right side likely carries telephone wires across the bridge. The large pipe on the left side of the roadway carries culinary water to the part of Rockville that is on the north side of the river.
Builder's Plaque and National Register of Historic Places Plaque. Notice the round heads of the rivets that hold the separate steel plates that make up this massive beam.
Here is the vertical post between the second and third panel. A diagonal brace is coming down from the right. The top of a crossbeam can be seen is front of the bottom of the post.
Looking back towards the north and down Bridge Road. Mt. Kinesava is framed by the portal bracing on the end of the bridge.
At the south end of the bridge, looking through it to the north.
Under the downstream northside of the bridge. On the left the bottom chord joins with the end post and the first crossbeam. The stringers run lengthwise between the crossbeams and they support the roadbed. The concrete abutment holds the weight of the bridge on steel plates set into it below each corner of the bridge structure. On the south side of the bridge the structure is pinnned in place to the abutement plates and on this side there is a series of rollers to allow for movement of the bridge.
The black stuff piled on the ledge of the abutment is asphalt crumbs from the roadbed that has fallen through the expansion joint on the end of the bridge and collected there. The black rocks are basalt boulder riprap that was put in to protect the bridge after massive flooding during December of 2010.
This roller bearing on the corner of the bridge supports 25% of the structure's weight. Two steel plates are attached to the concrete abutment. Above them are a series of steel rollers that the bridge sets on. The design is to allow the end of bridge to be able to move when the bridge flexes as a heavy load rolls over it. The rollers also allow for the bridge to expand and contract freely with temperature changes. As you can see - the rollers are clogged with dirt and gravel and asphalt debris from the roadbed. According to the UDOT bridge inspection reports, these bearing have been frozen in place since at least 1992. The original green paint can be seen on the steel.
Looking up at the bottom of the bridge. You can see how all the structural components of the deck tie in together with the superstructure.
Looking from south to north under the bridge. The crossbeams are 20 feet apart. The stringers are connected to the crossbeams and support the roadbed. The roadbed was originally wooden planks but is now an asphalt layer poured onto corregated steel sheets laid across the stringers.
A deck level view of the connections between a vertical post a diagonal brace and the bottom chord. You can see the corregated steel plate covered with asphalt setting on a stringer. The pipe carries Rockville's cullinary water across the river.
The southeast corner of the bridge, showing where the corner of the structure is help in place on the abutment with a steel pin.