# METRO PORTABLE #1

- **MSHA mine ID:** 3503558
- **Status:** Active
- **Type / commodity:** Surface / Crushed, Broken Stone NEC
- **Location:** Columbia, OR
- **Operator:** Knife River Corporation-Northwest
- **Controller:** Knife River Corporation
- **Public source rows linked:** 898
- **Source coverage:** 15 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**Knife River Corporation (0176802) → Knife River Corporation-Northwest (L16679) → METRO PORTABLE #1 (3503558)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **David M  Larson → Larson Construction Co., Inc.:** 2002-05-10 through 2003-07-15; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.
- **David M  Larson → H. E. Johnson & Sons Const. Co. Inc.:** 2003-07-16 through 2006-09-24; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.
- **Shawn  Teevin et al → Teevin & Fischer Quarry LLC:** 2006-09-25 through 2018-05-06; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.
- **Tom  Fischer et al → Teevin & Fischer Quarry LLC:** 2006-09-25 through 2018-05-06; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.
- **MDU Resources Group Inc → Knife River Corporation-Northwest:** 2018-05-07 through 2023-05-31; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.
- **Knife River Corporation → Knife River Corporation-Northwest:** 2023-06-01 through current/open; derived from co-tenure at mine 3503558; source `msha-controller-operator-history`.

- History rows: 6
- Typed edges: 15
- Interval anomalies: 0
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 4 since 2021:** Accidents and injuries 9 historical accident/injury rows; 0 coded fatalities and 187 lost days across the published record.
2. **COMPLIANCE — 9 since 2021:** Violations and penalties 155 violation rows across the full record; 57 carry an S&S flag and $42,622 appears in current assessed amounts.
3. **HEALTH — 13 samples:** Occupational health samples 13 personal. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 2K employee hours and 4 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 16 linked rows:** Contests, conferences and decisions 5 contested-violation rows, 5 civil-penalty docket/decision rows, and 6 conference records linked by issuance number.
6. **CONTRACTORS — 2 linked entities:** Contractors Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
7. **INSPECTIONS — 10 since 2021:** Inspections 67 inspection events and 976 published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 56.12023 — Guarding electrical connections and resistor grids.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12023
- **30 CFR 56.12008 — Insulation and fittings for power wires and cables.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12008
- **30 CFR 56.14100 — Safety defects; examination, correction and records.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14100
- **30 CFR 56.14107 — Moving machine parts.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 56.14132 — Horns and backup alarms.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14132
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.11002 — Handrails and toeboards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 46.7 — New task training.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-46/section-46.7

## Source coverage

- **Accident, Injuries, and Illnesses:** 9 rows; 2005-05-06 through 2026-06-01; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2026-07-01 through 2026-07-01; source ID `msha-addresses`
- **Assessed Violations:** 151 rows; 2002-08-21 through 2025-12-11; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 5 rows; 2010-09-20 through 2010-09-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 6 rows; 2011-03-31 through 2014-01-16; source ID `msha-conferences`
- **Contested Violations:** 5 rows; 2009-03-10 through 2009-03-10; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 197 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 48 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 6 rows; 2002-05-10 through 2018-05-07; source ID `msha-controller-operator-history`
- **Inspections:** 67 rows; 2002-08-21 through 2025-12-11; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 193 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 41 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 13 rows; 2009-03-11 through 2024-11-05; source ID `msha-personal-health-samples`
- **Violations:** 155 rows; 2002-08-21 through 2025-12-11; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/metro-portable-1-3503558`
- JSON: `/api/v1/mines/metro-portable-1-3503558`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/3503558/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/3503558/relationships`
- MCP resource: `mine://3503558/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`