The US Fish & Wildlife Service's National Wetland Inventory (NWI) initiative has been mapping wetlands in Utah since the 1980's. These maps are in the process of being converted to digital geospatial data for the state but have not been significantly updated in years within Utah's State Geographic Information Database (SGID).
The Utah Geological Survey, through an EPA grant, has enhanced the NWI product by compiling additional wetlands data from sources like the US Forest Service. UGS has also added descriptive fields to the NWI data model to make this information resource more intuitive and user friendly to the end users of the data. Utah Wetlands data is now available as two datasets: 1) the USFWS's NWI (Water.WetlandsNWI) and 2) the enhanced compilation stewarded by UGS (now called Water.Wetlands). Both of these datasets are available via ArcSDE Connection and downloadable as files from the SGID wetlands data webpage.
Even better, the UGS Wetlands layer is now available in a Wetlands interactive map so you can explore this new data set without GIS software and, for GIS users, before downloading it or using it as a data service.
UGS plans to update, periodically, this new wetlands dataset as more accurate data is made available. Those wishing to contribute data should contact Ryhan Sempler from DNR at RSempler@utah.gov or 801-537-3338.