About Big River Power Plant

Coal-Fired Generation and Asbestos-Containing Materials

Big River Power Plant was a coal-fired electric generating station located in Millard, Missouri (Washington County), operated by Union Electric Company (later AmerenUE, now Ameren Missouri). The facility was built and expanded during the 1940s through 1980s — when asbestos-containing materials were the industry standard for high-temperature insulation, fire protection, and mechanical system integrity.

According to the North American Powerhouse database, the facility was equipped with a boiler, online 1958** and a General Electric turbine, commissioned 1960, along with multiple supplemental generating units. Both pieces of equipment were installed during the peak era of asbestos specification in power plant construction.

Key operational characteristics:

  • Multiple generating units with boilers, turbines, and extensive steam and water piping systems
  • Routine maintenance outages that brought multiple skilled trades into close contact with insulation and equipment
  • Operating temperatures exceeding 1,000°F in generating areas
  • Facility retired from service in the early 2000s

The facility has been decommissioned, but its health legacy is very much alive for former employees and their families.

Big River Power Plant was one of several Ameren Missouri generating stations along the Mississippi River industrial corridor — the same corridor that ran through facilities such as Labadie Power Plant (Franklin County), Portage des Sioux Power Plant (St. Charles County), and industrial sites including operations in St. Louis and Granite City Steel across the river in Illinois. Workers along this corridor frequently transferred between facilities, worked for the same contractors during major outages, and were represented by the same union locals — meaning exposure histories at Big River often overlap with documented asbestos histories at those neighboring sites.

Why Asbestos-Containing Materials Were Standard at This Power Plant

Asbestos-containing materials were not incidental to Big River Power Plant operations — engineers and contractors specified them for documented performance reasons:

  • Extreme heat resistance: The boiler and associated steam distribution systems operated at 500–1,000°F. Asbestos-containing pipe covering, block insulation, refractory cements, and boiler insulation met that thermal load. Nothing else available at the time was cheaper or more effective.
  • Mechanical durability: Gaskets and packing materials on the General Electric turbine, pumps, valves, and flanges had to withstand pressure cycling, vibration, and chemical exposure. Asbestos-containing gaskets and packing were the industry standard through the 1970s.
  • Fire and electrical protection: Electrical panels, conduit systems, and structural fireproofing throughout the plant reportedly incorporated asbestos-containing materials to meet fire codes and electrical safety standards.
  • Cost efficiency: Through the 1970s, asbestos-containing products were among the least expensive insulation solutions available — a factor that made them economically attractive alongside their technical performance.

OSHA’s 29 CFR 1910.1001 standard and EPA asbestos regulations did not accelerate meaningful enforcement until the 1970s. By that point, many workers at Big River had already experienced years of potential exposure. Asbestos-containing materials also remained in place as legacy insulation throughout the plant long after new installation ceased — meaning maintenance and outage workers may have encountered these materials well into the 1980s and 1990s.

General Equipment at Big River Power Plant

The equipment below represents the systems and infrastructure documented or typically present at this facility during the era when asbestos-containing materials were specified in industrial construction. This is general facility-equipment reference — not a legal attribution of any specific product, manufacturer, or exposure event to this facility. Material-category and manufacturer information is addressed in the AsbestosIndex Product Crosswalk linked under the records table below.

Industrial Boilers View crosswalk › Process Piping View crosswalk › Pipe Insulation View crosswalk › Block Insulation View crosswalk › Valves View crosswalk › Gaskets View crosswalk › Pumps View crosswalk › Heat Exchangers View crosswalk › Cooling Equipment View crosswalk ›

Documented Asbestos Evidence — Missouri

The records below are verified, state-documented asbestos removals at this facility. Each entry represents a regulated abatement project where the Missouri Department of Natural Resources (Missouri DNR) was notified under federal NESHAP rules, the work was logged, and the asbestos-containing material was confirmed and removed under regulated conditions. These are not allegations or estimates — they are paper records tying documented asbestos-containing material to this specific site.

No Missouri DNR NESHAP abatement notifications have been identified for this facility in current public records. Per the framing above, absence of state-agency documentation should not be read as absence of asbestos — only as absence of a formal, regulated abatement event meeting reporting thresholds. Workers who recall encountering pipe insulation, block insulation, gaskets, or other asbestos-era construction materials at this facility may still have viable claims regardless of whether a state record exists.

Material Categories in Documented Records

The materials documented above (and similar asbestos-containing materials commonly encountered in records of this type) appear in the AsbestosIndex catalog with historical manufacturer and trust-fund information. Click a category to view manufacturers historically associated with that material:

Thermal System Insulation View crosswalk › Asbestos-Cement Board View crosswalk › Pipe Insulation View crosswalk › Roofing & Flashing View crosswalk › Spray Fireproofing View crosswalk › Floor Tile & Mastic View crosswalk › Ceiling Tile View crosswalk › Gaskets & Packing View crosswalk ›

Who May Have Been Exposed at Big River Power Plant

Occupational Groups at Elevated Risk

Multiple skilled trades worked directly with asbestos-containing materials at Big River Power Plant. The following occupations appear most frequently in asbestos exposure Missouri claims filed by workers at coal-fired plants of this era.

Heat and Frost Insulators (Local 1, St. Louis)

  • Members of Heat and Frost Insulators Local 1 reportedly performed much of the insulation work at Big River Power Plant and throughout the Ameren Missouri system, including at Labadie and Portage des Sioux
  • Reportedly worked directly with asbestos-containing pipe covering, block insulation, and insulating cement on a daily basis
  • Knife and saw cutting of asbestos-containing insulation generated substantial quantities of respirable fibers
  • Statistically the most heavily exposed craft at power plants during this operational period
  • Local 1’s jurisdiction covered the Missouri side of the Mississippi River corridor; members routinely dispatched to multiple Ameren Missouri facilities

Pipefitters and Steamfitters (UA Local 562, St. Louis)

  • UA Local 562 — one of the largest pipefitting locals in the Midwest — represented workers dispatched to Big River Power Plant and other Union Electric / Ameren Missouri facilities along the river corridor
  • Routinely removed and replaced insulated pipe sections, flanges, and valves
  • Allegedly disturbed existing asbestos-containing insulation during maintenance, releasing fibers into the work area
  • Handled asbestos-containing gaskets and packing materials as routine practice
  • May have been exposed during both new installation and removal of deteriorated materials
  • Workers who transferred between Ameren Missouri facilities likely carried accumulated exposure histories across multiple sites

Boilermakers (Local 27, St. Louis)

  • Boilermakers Local 27 represented workers at Big River Power Plant and at other boiler-intensive facilities throughout the Missouri side of the Mississippi River corridor, including Labadie Power Plant
  • Performed maintenance, repair, and overhaul work on the boiler and pressure vessels
  • Allegedly encountered asbestos-containing refractory materials, rope gaskets, and insulating cements
  • Often worked inside confined boiler spaces where fiber concentrations accumulated rapidly
  • Faced elevated potential exposure during boiler tube replacement and refractory repair

Electricians

  • May have been exposed to asbestos-containing materials located near insulated steam lines and equipment
  • Worked in electrical rooms where asbestos-containing panels, arc chutes, and fireproofing were allegedly installed
  • Exposure particularly likely during renovation or maintenance of electrical systems near high-temperature piping

Millwrights and Machinists

  • Maintained the General Electric turbine, pumps, and rotating equipment
  • May have encountered asbestos-containing gaskets, packing, and insulation during equipment disassembly and reassembly
  • Potential exposure documented in similar facilities during turbine overhauls and major equipment refurbishment

General Laborers and Maintenance Workers

  • Swept, cleaned, or worked in areas where other trades were allegedly disturbing asbestos-containing insulation
  • May have been exposed to fibers released by concurrent work activities — so-called bystander exposure
  • Cleanup and housekeeping in mechanical spaces created secondary exposure pathways

Plant Operators and Field Personnel

  • Made regular rounds through generating areas during normal operations
  • May have been exposed to ambient fibers, particularly during maintenance outages when multiple trades worked simultaneously

Contract Workers and Outside Contractors

  • Brought in during major maintenance outages and equipment overhauls
  • Equally entitled to legal remedies if they may have been exposed to asbestos-containing materials
  • Often worked without the safety awareness or oversight available to permanent plant employees
  • Contractor exposure records from Big River Power Plant outages may also overlap with documented exposure histories at Labadie, Portage des Sioux, and the greater St. Louis industrial corridor

Missouri — Filing Deadline & Next Steps

Missouri law gives mesothelioma and asbestos-disease claimants 5 years from the date of medical diagnosis to file a personal-injury lawsuit (Mo. Rev. Stat. § 516.120). For wrongful-death claims after an asbestos-related death, the filing window is 3 years from the date of death (Mo. Rev. Stat. § 537.100). The two deadlines run on separate tracks — preserving one does not extend the other.

The personal-injury clock runs from diagnosis, not from exposure. Mesothelioma latency is typically 20 to 50 years, so workers exposed in the 1950s–1980s are being diagnosed today.

Practical first steps

  1. Document what you remember. Pay stubs, W-2s, union cards, photographs, coworker names, and dates of employment. The WorkChain widget on this page can save a copy you can email yourself.
  2. Preserve medical records. Pathology reports, biopsy results, imaging, and pulmonary-function tests are central to both civil claims and trust-fund filings.
  3. Identify household members. Spouses who laundered work clothing and children of plant workers are eligible for secondary-exposure claims when diagnosed with an asbestos-related disease.
  4. Speak with an asbestos attorney with Missouri experience. The first conversation is free and confidential. Asbestos trust-fund claims and civil claims run on different tracks — both can be pursued in parallel.

Asbestos-Related Diseases — Missouri

Asbestos fiber exposure can cause several specific diseases that typically appear decades after the original exposure. The latency period — the gap between exposure and diagnosis — usually runs 20 to 50 years. That's why workers exposed in the 1960s, 1970s, and 1980s are receiving diagnoses today.

Mesothelioma

A rare, aggressive cancer that affects the lining of the lungs (pleural mesothelioma), abdomen (peritoneal), or heart (pericardial). Mesothelioma is almost exclusively caused by asbestos exposure, which is why a mesothelioma diagnosis often points directly to historical workplace exposure. Average latency from first exposure to diagnosis is 30-50 years.

Asbestosis

A chronic, non-cancerous scarring of lung tissue caused by inhaled asbestos fibers. Asbestosis causes progressive shortness of breath, persistent cough, and reduced lung function. It does not improve with treatment, and it is a recognized basis for a claim under most trust schedules and civil claims.

Lung Cancer

Asbestos exposure significantly increases the risk of lung cancer, particularly when combined with a history of smoking. Asbestos-related lung cancer is compensable under the same trust schedules and civil claim avenues as mesothelioma.

Other Recognized Diseases

Pleural plaques, pleural thickening, laryngeal cancer, ovarian cancer, and certain gastrointestinal cancers are also recognized as asbestos-related under various trust schedules and case-law authorities, though eligibility and proof requirements vary by claim type.

If you have any of these diagnoses and you worked at this facility, lived with someone who did, or were exposed in any documented capacity, you may have a claim worth pursuing. Speak with an attorney before assuming you don't qualify.

Data Sources — Missouri

Information about facility equipment, industrial materials, and occupational records referenced on this page is drawn from publicly available sources where applicable, including:

If specific equipment or product claims in this article are sourced from a non-public database, the source is identified parenthetically within the text above.