1. Wyoming’s NHD and WBD Maintenance and Enhancements NHD/WBD Stewardship Conference March 29-30, 2012 New Orleans, Louisiana Paul Caffrey Wyoming Geographic Information Science Center (WyGISC)

2. Overview  What have we done  What have we not done  What next  Discussion/Questions

4. State Events Dams Gaging stations Diversion structures

5. State Dam/Gaging Station/Diversion Structure  1,458 new Dam Events were added that were not originally captured in NHD  56 existing Dam Events were spatially corrected (these dams were originally captured in NHD, but not at correct location/point along NHD Flowline)  90 new Gaging Station Events were added  24 new Diversion Structure Events with radio telemetry

6. GNIS & NHD Performed a check to locate and correct 1.Missing 2.Misspelled 3.Misplaced named features for the streams, rivers, lakes and point features in Wyoming

7. GNIS & Hydrographic Features

9. GNIS & NHD For the NHD, the task for assigning names to water features using the GNIS was a pretty straightforward process. Unfortunately, discrepancies and errors persist due to: low resolution GNIS vectors and points and coordinate errors interpretative mistakes made during GNIS conflation process while creating the hydrographic data.

10. Example: GNIS line vectors

11. GNIS updates made to Wyoming’s NHD Streams:  97 NHD Flowlines (originally unnamed) received GNIS names and ID numbers  129 NHD Flowlines received corrections to their GNIS name and/or ID number  19 are unable to be corrected due to inherent GNIS coordinate errors and other issues

12. Lakes/Reservoirs:  638 NHD unnamed Waterbodies received GNIS names and ID numbers  118 NHD Waterbodies received corrections to their GNIS name and/or ID number  123 WB features missing geometry have been captured

13. Lakes/Reservoirs (cont.):  34 NHD Waterbodies with missing or incorrect GNIS names/IDs are still in need of correction  294 are unable to be corrected due to inherent GNIS coordinate errors and other issues

14. Springs/Waterfalls/Rapids: 206 missing features currently being captured, soon to be added to NHD Point geometry 236 NHD Points with missing or incorrect GNIS names/IDs in need of correction 62 not corrected due to inherent GNIS coordinate errors

15. WBD- Hydrologic Unit Name Updates  151 watersheds (10-digit units) have received an updated HU_10_NAME  52 of these are shared with one or more bordering states and are awaiting coordination  1,309 subwatersheds (12-digit units) have received an updated HU_12_NAME  153 of these are shared with one or more bordering states and are awaiting coordination

16. NHD/WBD Pour Points

17. Primary purpose for creating the True Pour Point features was twofold: 1)To capture the most accurate geographic location of all WBD outlets/stream drainage points using the 2009 NAIP 2)To assess the horizontal accuracy and vertical alignment discrepancies between a stream's current pour point location and its WBD and NHD counterpart Pour Point/NHD average offset distance equaling ~70 meters Pour Point/WBD average offset distance equaling ~121 meters.

18. NHD/WBD Pour Points  2,327 True Pour Points were placed at the most horizontally accurate/current geographic location of drainage points for all streams at WBD outlets  The number of True Pour Points exceed the number of WBD outlets (2,195), due to multiple drainage points from complex stream channels  2,192 NHD Pour Point Events were indexed to the top of all NHDFlowline reaches draining from WBD outlets

21. NHD/WBD Pour Points

25. Acknowledgements- USGS/NRCS NHD/WBD Team Barb Ray, WY Geo-Liaison Wyoming BLM: State Office, Rick Schuler Wyoming State Engineers Office Jason Feltner Wyoming Board of Geographic Names UW/WyGISC Team Pat Madsen, GIS Specialist

26. Discussion Questions