What This Source Covers
Wetland polygons with wetland classification fields from the National Wetlands Inventory layer.
This layer provides a durable wetland reference for environmental screening and municipal-level map interpretation.
Why Someone Would Open This Page
This source appears on 106 of the 219 mapped place pages in the Allegheny County section, including 82 borough and township pages and 24 Pittsburgh neighborhood pages. That gives a quick sense of how broadly the layer is used across the county.
The example below is here to make the source concrete. Instead of talking about the layer in the abstract, the page shows what it actually looks like on the map.
Example Map
This page uses 027 – National Wetlands Inventory in West Deer Twp. as the example area. Dense sources use a full selected place; lighter sources use the full sample area.
Live Example Map
National Wetlands Inventory
West Deer Twp. / Environment / polygon sample
Full municipality wetlands sample.
Quick Facts
| Fact | Current value |
|---|---|
| Rows in the source | 777 |
| Main data fields | 8 |
| Total fields | 10 |
| Source system | PASDA AlleghenyCounty MapServer layer 23 |
| Map geometry | PASDA layer 23 |
| Mapped place pages using this source | 106 / 219 (48.4%) |
| Example area used here | West Deer Twp. |
| Features drawn in this example | 58 |
Where You Will See It
| Place type | Coverage |
|---|---|
| All mapped place pages in the county section | 219 |
| Pages using this source | 106 (48.4%) |
| Borough and township pages | 82 / 129 |
| Pittsburgh neighborhood pages | 24 / 90 |
| Pages where the source is hidden | 113 |
For Technical Readers
- Source table:
[WPRDC PASDA].[027 - NWI] - Refresh procedure:
[WPRDC PASDA].[027 - NWI update] - Documentation map table:
[Allegheny].[WPRDC PASDA MAPS].[Documentation Map - 027 - National Wetlands Inventory] - Metadata timestamp: 2026-03-16T17:09:07.925Z
Field List
The table below lists the current columns in [WPRDC PASDA].[027 - NWI].
| # | Field | SQL type | Nullable | Role |
|---|---|---|---|---|
| 1 | OBJECTID |
nvarchar(4000) |
Yes | Attribute |
| 2 | AREA_ |
nvarchar(4000) |
Yes | Attribute |
| 3 | PERIMETER |
nvarchar(4000) |
Yes | Attribute |
| 4 | WTLNDNWI_ |
nvarchar(4000) |
Yes | Attribute |
| 5 | WTLNDNWI_I |
nvarchar(4000) |
Yes | Attribute |
| 6 | WETLAND_CL |
nvarchar(4000) |
Yes | Attribute |
| 7 | SHAPE_Length |
nvarchar(4000) |
Yes | Attribute |
| 8 | SHAPE_Area |
nvarchar(4000) |
Yes | Attribute |
| 9 | geometry_type |
nvarchar(200) |
Yes | Geometry storage |
| 10 | geometry_json |
nvarchar(max) |
Yes | Geometry storage |