While mapping them, I soon found that SNCDs come in many shapes and sizes. Because of this, I also decided to classify them based on their size, their provision of POCBs, and their health. I came up with six categories, listed below, followed by an aerial photo of an example location for each.
Exceptional Main Street: These SNCDs have a historic main street feel and consist of an approximately 600+ foot street segment with Grade One POCBs covering at least 75% of the street frontage on both sides. [Gaylord & Mississippi]
Quality Cluster: More of a cluster than a corridor, these have > 75% of their street frontage lined with Grade One POCBs, but are not large enough to qualify for “main street” designation. [23rd & Dexter]
Mixed Main Street: These are large corridors, but have more automobile oriented buildings, Grade Two POCBs, and/or parking lots mixed in, causing the percentage of Grade One POCBs to fall below 75%. [1st & Knox]
Mixed Cluster: Same logic. Like a Mixed Main Street, but not large enough. [11th & Ogden]
Corner Store: Any isolated POCB which contains multiple businesses. I did not account for those which only contain one business because they are harder to locate. [Race & Kentucky]
Degraded: SNCDs where most of the buildings are vacant, have been torn down, or have been converted to residential uses. This is not comprehensive, and there are certainly many more. In the final image below, you can see modern day Old West Colfax. It was once entirely lined with buildings, but now only a few remain, replaced by parking lots. [Old West Colfax]