|17th Street dead-ended at Shelton Ditch, 1969 USGS|
But circa 1980, they were projecting over 20,000 trips per day for year 2000 traffic volumes!
There's a whole lot we got wrong about 17th Street.
|17th and Mission today|
The Mission Street Overpass FEIS fills in a lot of the history. The Mission Street project had attached to it a project for 17th Street, and it rehearses some of the even earlier history.
This 17th Street appendix to the Mission Street project appears to have both bridged Shelton Ditch and created the connection to Mission Street. The final design reduced the cross-section from four standard auto lanes to two standard auto lanes, a center turn pocket, and bike lanes: A typical "road diet" configuration. It seems, in fact, to be Salem's first instance of a road diet.
Here are the counts circa 1980.
Here are the projected year 2000 counts and the latest counts from the City traffic count site (most of these are 2010s, but there's were a couple from the mid-2000s).
|Year 2000 projected traffic counts|
(actuals from City)
|State Street Study|
Once we hit that 20 year mark, or whatever horizon is in the original planning, all of our projects should have a detailed assessment of modeling and assumptions. This is a great shortcoming in traffic planning and engineering, that there is no feedback loop or self-assessment scheme. Once a project is done, planners and engineers show little interest in asking "how'd we do?"