# NORTHWESTERN CORPORATION — Lewis and Clark County, MT

**Citation:** NPMS FIPS 30049 / OPID 31632  
**Type / status:** inspection / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2026-07-16

130.873252 active Natural Gas pipeline miles in Lewis and Clark County, MT; public NPMS snapshot 2026-07-16.

## Document text

NORTHWESTERN CORPORATION (PHMSA OPID 31632) reported 130.873252 active Natural Gas pipeline miles in Lewis and Clark County, MT (county FIPS 30049) 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: `1eaa2df91ef323fb7d40a62343484c1d62f8085497097a9e5c12441eaa091358`
- Retrieved: 2026-08-20T04:38:11.081Z
- Exported: 2026-08-24T19:22:56.157Z
- Document slug: `npms-mileage-5af8b5db4a1b0b236d02dc70`

### Source metadata

```json
{
  "materialSubtype": "pipeline_mileage",
  "dataAsOf": "2026-07-16",
  "dateBasis": "data_as_of_not_publication_date",
  "fips": "30049",
  "stateFips": "30",
  "state": "MT",
  "county": "Lewis and Clark County",
  "region": "Lewis and Clark County, MT",
  "operator": {
    "id": "31632",
    "name": "NORTHWESTERN CORPORATION"
  },
  "commodity": "Natural Gas",
  "mileage": 130.8732519,
  "plantCount": null,
  "snapshotScope": "active_assets_only",
  "personalContactDataExcluded": true,
  "restrictedGisExcluded": true,
  "provenance": {
    "workbook": "pipeline_mileage",
    "sheet": "Summary - Cnty, Oper, Commodity",
    "rowNumber": 7119,
    "rowSha256": "3b47a5d21664aa91f12c360fdf49e41a20251e7ab3f32cc51e13b785a7daf44a"
  },
  "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"
}
```