{ "name":"Modeling/EspaWatersheds", "title":"Modeling/EspaWatersheds", "type":"Map Service", "typeKeywords":["ArcGIS Server","Service","Map Service"], "description":"

This dataset contains portions of the HUC8 watersheds, and in some cases the HUC10 watersheds, that are coincident with the Snake Headwaters (HUC6-170401) and the Upper Snake (HUC6-170402) watersheds, excepting the Salmon Falls (HUC8-1704213) and a portion of the Upper Snake-Rock (HUC8-17040212) watersheds. The Watershed Boundary Dataset (WBD) was accessed on December 20, 2023. https://hydrowfs.nationalmap.gov/arcgis/rest/services/wbd/MapServer <\/span><\/p>

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The Upper Henrys (HUC8-17040202) and Lower Henrys (HUC8-17040203) watersheds were merged into one tributary basin and named Henry\u2019s Fork.<\/span><\/p>

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The Big Cottonwood Creek (HUC10-1704021202) watershed was included. <\/span><\/p>

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Portions of watersheds that are coincident with the Eastern Snake Plain Aquifer Model (ESPAM) 2.1 active model domain were replaced with the ESPAM2_ModelGrid_boundary shapefile using the Erase and Append GP tools. (ESPAM2_ModelGrid_boundary.shp represents the ESPAM2.1, and according to the Hydrology Section Technical Engineer 2, the model boundary is the same for ESPAM2.2 and ESPAM2.1.) <\/span><\/p>

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This process created slivers in several HUC8 watersheds along the outer edge of the ESPA Model Boundary, and these slivers (area < 40 sq km) were merged into a nearby HUC8 as follows:<\/span><\/p>

One portion of the Beaver-Camas (HUC8-17040214) into the Henry\u2019s Fork tributary basin.<\/span><\/p>

Two portions of the Teton (HUC8-17040204) into the Henry\u2019s Fork tributary basin.<\/span><\/p>

One portion of the Little Wood (HUC8-17040221) into the Big Wood (HUC8-17040219).<\/span><\/p>

One portion of the Big Lost (HUC8-17040218) into the Little Lost (HUC8-17040217).<\/span><\/p>

Two portions of the Idaho Falls (HUC8-17040201) into Palisades (HUC8-17040104).<\/span><\/p>

One portion of the Idaho Falls (HUC8-17040201) into Willow (HUC8-17040205).<\/span><\/p>

Two portions of the Idaho Falls (HUC8-17040201) into Teton (HUC8-17040204).<\/span><\/p>

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The following tributary basins were broken out from Lake Walcott (HUC8-17040209):<\/span><\/p>

Wagon Butte was re-named from HUC10-1704020910.<\/span><\/p>

Marsh was re-named from the largest of the three HUC10 watersheds that intersect (HUC10-1704020906). The other HUC10 watersheds are Brigham Point-Snake River (HUC10-1704020904) and Milner Dam-Snake River (HUC10-1704020913).<\/span><\/p>

Rock was re-named from the largest of the three HUC10 watersheds that intersect (HUC10-1704020901). The other HUC10 watersheds are Massacre Rocks-Snake River (HUC10-1704020903) and a small portion of Brigham Point-Snake River (HUC10-1704020904).<\/span><\/p>

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The following tributary basin was broken out from the Upper Snake-Rock (HUC8-17040212):<\/span><\/p>

Clover was re-named from HUC10-1704021212.<\/span><\/p>

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The following tributary basins were not broken out from HUC8 watersheds:<\/span><\/p>

Ross Fork (HUC10-1704020806) was not broken out from the Portneuf (HUC8-17040208).<\/span><\/p>

Thorn Creek (HUC10-1704021908) was not broken out from the Big Wood (HUC8-17040219).<\/span><\/p>

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This dataset was created using the following steps:<\/span><\/p>

1. Select the HUC8 watersheds that are coincident with the Snake Headwaters (HUC6-170401) and the Upper Snake (HUC6-170402) watersheds. Export the selection to a new feature class (25 records).<\/span><\/p>

2. Select the Big Cottonwood Creek (HUC10-1704021202) watershed. Export the selection to a new feature class (1 record).<\/span><\/p>

3. Use the Append GP tool to append the Big Cottonwood Creek feature class created in Step 2 to the HUC8 watersheds selection feature class created in Step 1.<\/span><\/p>

4. Use the Erase GP tool to cut out the ESPA model boundary from the HUC8 watersheds selection feature class.<\/span><\/p>

5. Use the Multipart to Singlepart GP tool on the feature class created in Step 4.<\/span><\/p>

6. Use the Append GP tool to append the ESPA model boundary to the feature class created in Step 5. This feature class will be modified with Steps 7-9.<\/span><\/p>

7. Delete those portions of the Salmon Falls (HUC8-1704213) and Upper Snake-Rock (HUC8-17040212) watersheds that fall outside of the ESPA model boundary.<\/span><\/p>

8. Use the Modify Features: Merge Features editing tool to merge certain features as documented above.<\/span><\/p>

9. Re-name certain features based on HUC10 watersheds as documented above.<\/span><\/p>

10. Modify the attribute table by adding and populating the following fields:<\/span><\/p>

Ref_HUC8<\/span><\/p>

Ref_HUC10<\/span><\/p>

Ref_Name<\/span><\/p>

LabelName<\/span><\/p>

11. Modify the attribute table by removing the following fields:<\/span><\/p>

TNMID<\/span><\/p>

METASOURCEID<\/span><\/p>

SOURCEDATADESC<\/span><\/p>

SOURCEORIGINATOR<\/span><\/p>

SOURCEFEATUREID<\/span><\/p>

LOADDATE<\/span><\/p>

GNIS_ID<\/span><\/p>

AREAACRES<\/span><\/p>

AREASQKM<\/span><\/p>

STATES<\/span><\/p>

HUC8<\/span><\/p>

ORIG_FID<\/span><\/p>

12. Use the Project GP Tool to project the feature class to NAD 1983 Idaho TM (Meters).<\/span><\/p>

13. Export as a shapefile.<\/span><\/p><\/div><\/div><\/div>", "extent":[[2298946.4997990173,2933989.0292009837],[1146935.4101549988,1526541.838345001]], "url":"https://gis.idwr.idaho.gov/hosting/rest/services/Modeling/EspaWatersheds/MapServer" }