Historic bridges ( how many are we still driving across?)

and are they maintained? (probably many are not)
http://bridgehunter.com/category/year/built-during-1910s/

main site:
http://bridgehunter.com/


samples:



Facts

Overview
Through truss bridge over East Fork Des Moines River on 110th Street
Location
Humboldt County, Iowa
Status
Open to one-lane traffic
History
Built 1911 by the Iowa Bridge Co.
Builder
- Iowa Bridge Co. of Des Moines, Iowa
Design
Pin-connected, 5-panel Pratt through truss
Dimensions
Length of largest span: 89.9 ft.
Total length: 109.9 ft.
Deck width: 15.7 ft.
Vertical clearance above deck: 10.7 ft.
Approximate latitude, longitude
+42.89204, -94.18370 (decimal degrees)
42°53'31" N, 94°11'01" W (degrees°minutes'seconds")
Approximate UTM coordinates
15/403348/4749505 (zone/easting/northing)
Land survey
T. 93 N., R. 28 W., Sec. 5
USGS topographic map
Saint Joseph
Inventory numbers
IA 185150 (Iowa bridge number)
BH 13651 (Bridgehunter.com ID)
Inspection (as of 01/2009)
Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 19.5 (out of 100)
Average daily traffic (as of 2003)
30

"

A lift bridge whose center span raises to a height of 170 feet, the Memorial Bridge was dedicated in 1923 to the veterans of World War I. Footings for the bridge were reportedly sunk as much as 82 feet into bedrock.

The bridge is one of three that cross the Piscataqua River in Portsmouth, the other being the Sarah Mildred Long Bridge (aka Middle Bridge) and the Piscataqua River (aka High-Level or I-95 Bridge).

In summer, the bridge goes up every half hour, on the half hour, to accommodate river traffic. Pedestrians can walk between Portsmouth and Kittery, Maine.