# NORTHWEST NATURAL GAS CO — Underground natural gas storage annual report (2022)

**Citation:** PHMSA Annual Report 20230089 (2022)  
**Type / status:** inspection / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2022-12-31

Underground natural gas storage; reporting year 2022; OR. Operator-reported infrastructure data.

## Document text

Underground natural gas storage annual report for reporting year 2022, submitted by NORTHWEST NATURAL GAS CO (operator 13840). Reported scope: OR. Represented states: OR. Referenced facilities: Mist. Attached form tables: UNGS AR Part B: 1 related row; UNGS AR Part C: 8 related rows. The sortable date is the reporting-period end, not the operator submission date.

## Provenance

- Official: Yes
- Source: <https://data.transportation.gov/d/aemm-7pyq>
- Source ID: `phmsa-annual-reports`
- SHA-256: `478c28643508f07189dcdfb7c40c34db6bb77a3051fc7cea415e21b4f38bb784`
- Retrieved: 2026-08-13T02:59:50.318Z
- Exported: 2026-08-27T11:09:12.132Z
- Document slug: `phmsa-annual-924bdf99355e9660cc04e106`

### Source metadata

```json
{
  "materialSubtype": "phmsa_pipeline_annual_report",
  "dataset": "underground_natural_gas_storage",
  "reportYear": 2022,
  "reportNumber": "20230089",
  "supplementalNumber": "5242",
  "sourceFormat": "modern_xlsx",
  "operator": {
    "id": "13840",
    "name": "NORTHWEST NATURAL GAS CO"
  },
  "region": "OR",
  "commodity": null,
  "representedStates": [
    "OR"
  ],
  "jurisdictionClasses": [],
  "facilities": [
    "Mist"
  ],
  "metrics": {},
  "dependentRowsBySheet": {
    "UNGS AR Part B": 1,
    "UNGS AR Part C": 8
  },
  "dataAsOf": "2026-02-02T07:32:43.000Z",
  "reportingPeriodEnd": "2022-12-31",
  "dateBasis": "calendar_year_end_not_submission_date",
  "provenance": {
    "archive": "annual_underground_natural_gas_storage_2017_present.zip",
    "archiveSha256": "4682d4dc5904c3cf65ac317a8b647abf41725580887927043f0b80d68c67bb31",
    "workbook": "annual_underground_natural_gas_storage_2022.xlsx",
    "sheet": "UNGS AR Part A and D",
    "rowNumber": 40,
    "sourceRowNumbers": [
      40
    ],
    "rowSha256": "f8e0c94c5c8adea818ab34a3a3b8cedd6c1d4928127c076969cd7e2a58670002"
  },
  "caveat": "Operator-reported annual infrastructure data may be corrected. The indexed date is the reporting-period end, not the submission date, and the record is not an agency finding about current facility condition.",
  "jurisdiction": "US",
  "operatorName": "NORTHWEST NATURAL GAS CO"
}
```