# NORTHWESTERN CORPORATION — Ravalli County, MT

**Citation:** NPMS FIPS 30081 / OPID 31632  
**Type / status:** inspection / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2026-07-16

33.789926 active Natural Gas pipeline miles in Ravalli County, MT; public NPMS snapshot 2026-07-16.

## Document text

NORTHWESTERN CORPORATION (PHMSA OPID 31632) reported 33.789926 active Natural Gas pipeline miles in Ravalli County, MT (county FIPS 30081) 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: `8482ad2fb1d25a8fc8ac16206b59a635ac1334f7425433905d1aeda527ee4c61`
- Retrieved: 2026-08-20T04:38:11.081Z
- Exported: 2026-08-25T14:53:13.025Z
- Document slug: `npms-mileage-82f2df8864b34bbf19098bf9`

### Source metadata

```json
{
  "materialSubtype": "pipeline_mileage",
  "dataAsOf": "2026-07-16",
  "dateBasis": "data_as_of_not_publication_date",
  "fips": "30081",
  "stateFips": "30",
  "state": "MT",
  "county": "Ravalli County",
  "region": "Ravalli County, MT",
  "operator": {
    "id": "31632",
    "name": "NORTHWESTERN CORPORATION"
  },
  "commodity": "Natural Gas",
  "mileage": 33.78992614,
  "plantCount": null,
  "snapshotScope": "active_assets_only",
  "personalContactDataExcluded": true,
  "restrictedGisExcluded": true,
  "provenance": {
    "workbook": "pipeline_mileage",
    "sheet": "Summary - Cnty, Oper, Commodity",
    "rowNumber": 7145,
    "rowSha256": "0eb8ec7041d651dc45562837d1a261f5ac36c7176c7fb8052d0cead16546a44c"
  },
  "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": "NORTHWESTERN CORPORATION"
}
```