# MOUNTAINWEST PIPELINE, LLC — Sweetwater County, WY

**Citation:** NPMS FIPS 56037 / OPID 12874  
**Type / status:** inspection / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2026-07-16

510.068682 active Natural Gas pipeline miles in Sweetwater County, WY; public NPMS snapshot 2026-07-16.

## Document text

MOUNTAINWEST PIPELINE, LLC (PHMSA OPID 12874) reported 510.068682 active Natural Gas pipeline miles in Sweetwater County, WY (county FIPS 56037) in the public NPMS summary snapshot dated 2026-07-16. The snapshot includes active assets only and excludes permanently abandoned assets. Exact pipeline locations and restricted NPMS GIS data are not included.

## Provenance

- Official: Yes
- Source: <https://www.npms.phmsa.dot.gov/Documents/NPMS_Active_Pipe_County_Mileage.xlsx>
- Source ID: `npms-public-summaries`
- SHA-256: `7b7316454ccb29b7947b86394c94e2e78888b7df947a5058468a90bd162db158`
- Retrieved: 2026-08-20T04:38:11.081Z
- Exported: 2026-08-25T17:21:20.990Z
- Document slug: `npms-mileage-27798d2581ef439dfd1a13c4`

### Source metadata

```json
{
  "materialSubtype": "pipeline_mileage",
  "dataAsOf": "2026-07-16",
  "dateBasis": "data_as_of_not_publication_date",
  "fips": "56037",
  "stateFips": "56",
  "state": "WY",
  "county": "Sweetwater County",
  "region": "Sweetwater County, WY",
  "operator": {
    "id": "12874",
    "name": "MOUNTAINWEST PIPELINE, LLC"
  },
  "commodity": "Natural Gas",
  "mileage": 510.06868179,
  "plantCount": null,
  "snapshotScope": "active_assets_only",
  "personalContactDataExcluded": true,
  "restrictedGisExcluded": true,
  "provenance": {
    "workbook": "pipeline_mileage",
    "sheet": "Summary - Cnty, Oper, Commodity",
    "rowNumber": 15466,
    "rowSha256": "eacc717fa790649dbd83afb7288d72c6e8d3aa0fd2b7a2f385b929a62169e9bc"
  },
  "citedSections": [
    "191.29"
  ],
  "caveat": "Public aggregate snapshot only. It is not a complete representation of exact pipeline locations, may be updated, and is not an agency finding about facility condition.",
  "jurisdiction": "US",
  "operatorName": "MOUNTAINWEST PIPELINE, LLC"
}
```