Allegheny St Dauphin
License: Creative Commons Attribution (CC BY)
The single span, 50'-long, reinforced concrete deck arch bridge is supported on concrete abutments with flared wingwalls. The bridge is finished with metal railings and concrete posts. The plain arch bridge is a standard design of the state highway department with no unusual or noteworthy features. The bridge was constructed in 1941 as part of the project to realign and widen US 22. The project was a typical state highway improvement built to bypass the old route that was carried on the stone arch upstream. It is not a historic road. The bridge is not historically or technologically distinguished by its setting or context.
This Allegheny Street bridge was not replaced nor substantially renovated during the Dauphin Bypass project. Only the open steel railings of the original structure were removed and replaced with solid reinforced concrete sidewalk parapets, in order to prevent small children from falling through the decorative grating. The roadway also had been resurfaced.
To Nathan's point the bridge data is correct for the 1947 bridge which is the entry I have here. What might not be correct is if this 1947 bridge still exists or this bridge was heavily modified (e.g., jersey barriers replaced metal railings). So if I am understanding you right, you are saying that the Allegheny Bridge was replaced, not modified, when they did the bypass? If that's true then we'll need to update the status. Thanks in advance for any additional information.
FYI, The Pennsylvania Historic Bridge Inventory dates to 1997. Minor updates were made in 2001 and 2008 but these failed to comprehensively update the descriptions. So many descriptions in the inventory are out of date.
The original description of this bridge notes the presence of a smaller bridge immediately downstream, used as an entrance ramp to US-22. It also notes an older, 1875-era stone arch bridge to the north which formerly carried US-22 and was now designated a carrying PA-225.
This information is no longer valid.
Following completion of the Dauphin Borough Bypass project in the mid- to late-1990s, both bridge structures were demolished. The former Erie Street Bridge north of the subject bridge became redundant, and the the former southbound US-22 ramp bridge was no longer needed, as the present ROW for US 22-322 now includes no SB on ramp to the bypass. PA-225 terminus was relocated west of the Borough of Dauphin, to a new interchange that includes entry and exit for US-22/322 in both directions.
I'm not certain, but I think this bridge might be newer than the 1940's. The current bridge at Allegheny St. looks like a UCEB. PENNDOT's historic bridge data states "The bridge is finished with metal railings and concrete posts."
If you look at the Bing map photo you can see an abutment on the north side of the creek and on the south it looks like they use the railing to stop people from falling into the creek (to the west of the current bridge).
I know that in the late 1990s PENNDOT bypassed Dauphin Borough so I am wondering if this is the case. Does anyone have more information on the bridge here?
Also there's a small discrepancy on the build date. NBI notes the build date as 1941, however PENNDOT notes it as 1942.