Talk:Crown Point (Oregon)

what is the Crown Point Viaduct?

Skyline Drive example of a roadway section which is historic but probably not a "viaduct"

Park Avenue Viaduct section which is a genuine bridge

The topic Crown Point Viaduct redirects to this article. I think it is a contributing structure in the Historic Columbia River Highway, so listed (as a contributing structure) on the National Register of Historic Places. Is it a bridge? "Driving" through using Google Streetmaps, I see some historic railings etc, like I know exist as part of CCC works on Skyline Drive in Virginia. But I can't see if there are pillars supporting the roadway below, i.e. if the roadway is like on a bridge, so qualifying as a viaduct as defined in Wikipedia's article "series of arches, piers or columns supporting a long elevated railway or road". Sometimes a viaduct is a bridge in fact, or includes a genuine bridge, e.g. Park Avenue Viaduct at Grand Central in NYC. I can't see what this is, here. And am not sure whether to include it in List of bridges on the National Register of Historic Places in Oregon, or how to cover it in Historic Columbia River Highway (see discussion at Talk:Historic Columbia River Highway). Are there photos from below? Help! --Doncram (talk) 18:43, 12 January 2022 (UTC)

Is that a real viaduct underneath the roadway outside, going around the Vista House? Hard to tell

Maybe? Note the first of two photos accompanying the Vista House NRHP nomination is a bit clearer, showing columns below.

Does this series of arches make a viaduct? I think not, as those just look like arches within the wall/railing, like to let water in or out. Is the roadway lifted at all from the ground by them? I think not.

Not sure what this. If it is just open structure under the Vista House or under the roadway, does not seem like part of a viaduct, or part of a real bridge.

I'm not sure exactly what is the viaduct, is it just a section right around the Vista House, or is it supposed to include roadway up and down, where there are stone walls/railings by the road which might or might not be supported by arches or columns from below. Could anyone take photos of any actual series of arches from below (below the Vista House, or below some other stretch of roadway before or after it)? --Doncram (talk) 18:51, 12 January 2022 (UTC)

Note the first of two photos accompanying the Vista House NRHP nomination is a bit clearer, showing elevated roadway around the Vista House, elevated by columns, but no arches. Are there arches somewhere else? --Doncram (talk) 19:08, 12 January 2022 (UTC)

Hmm, HABS/HAER webpage on or0364 "Historic Columbia River Highway, Crown Point Viaduct, Encircling Vista House at Crown Point, Troutdale, Multnomah County, OR" has link to "Data pages" and photos. This document seems to define viaduct as just the sidewalk and retaining wall along the outside of the roadway loop. It defines a viaduct differently than Wikipedia does, i.e. without arches? Hmm, no, Wikipedia defines "A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road." It discusses a number of other viaducts and "half-viaducts" along the Historic Columbia River Highway. Hmm, I am not feeling this "viaduct" is a bridge, nor the others that it discusses, for inclusion in List of bridges on the National Register of Historic Places in Oregon, say. I dunno. --Doncram (talk) 19:38, 12 January 2022 (UTC)