Coal-Slurry Impoundments and Flood Risk in Logan County, West Virginia

What happened at Buffalo Creek, and why it still matters

On February 26, 1972, a coal-waste impoundment dam on Buffalo Creek in Logan County -- built by stacking mining refuse across the mouth of a hollow to hold back water and slurry -- failed after several days of heavy rain. The collapse released more than 100 million gallons of black water and coal waste in a wave that swept down the narrow valley in minutes, killing 125 people, injuring more than 1,000, and destroying or seriously damaging over 500 homes across several small communities strung along the creek. It remains one of the deadliest dam failures in US history, and it happened because a coal-refuse pile doubling as a dam was built without engineering standards comparable to a conventional water-supply or flood-control dam.

The disaster's legacy is not just historical: it is credited with directly driving West Virginia's 1973 Dam Control Act (now codified at W. Va. Code § 22-14) and with contributing to Congress passing the federal Surface Mining Control and Reclamation Act (SMCRA) in 1977, which established the modern national framework for regulating surface coal mining, including refuse and slurry impoundments. Both of those laws remain the backbone of how a coal-refuse impoundment gets permitted, inspected, and eventually closed in West Virginia today, and Logan County -- as the place that produced this regulatory framework -- is a useful reminder that this is a real, ongoing category of risk in hollow terrain, not only a 1972 event.

How coal-refuse impoundments are regulated today, and what counts as a "dam"

Under West Virginia's current framework, a coal-refuse site becomes a regulated "dam" once it crosses specific size thresholds -- rising 25 feet or more above a stream bed and able to impound 15 acre-feet of water, or rising just 6 feet or more if it can impound 50 acre-feet -- and once it meets that definition, it falls under the Dam Control Act and the state's coal-specific dam-safety rule, 38 CSR 4, administered by the WV Department of Environmental Protection's Division of Mining and Reclamation alongside the broader Surface Mining Reclamation Rule, 38 CSR 2. In practice, that means active and legacy coal-refuse impoundments in coalfield counties like Logan are supposed to be permitted, engineered, and inspected on an ongoing basis -- but that a given impoundment's current condition and hazard classification is something only DEP's Division of Mining and Reclamation can confirm for a specific site, not something a land buyer can assume from the fact that a mine operated in the area decades ago.

For a land buyer evaluating a specific Logan County parcel, particularly one sitting in or below a narrow hollow with any history of coal mining upstream, this translates into a concrete due-diligence step: ask DEP's Division of Mining and Reclamation directly whether any permitted or legacy coal-refuse impoundment sits above the parcel, and separately check whether any dam near the parcel appears in the National Inventory of Dams (which the state's own Dam Safety Section contributes non-coal dam data to) with a high- or significant-hazard classification. Neither inquiry is a substitute for a professional flood-risk or geotechnical evaluation, but both are free, direct questions that a specific hollow-terrain parcel in this county deserves before you buy, given exactly what happened here in 1972.

Not just 1972: a historic flood as recently as February 2025

Buffalo Creek is the clearest illustration of Logan County's hollow-terrain flood risk, but it is not the only one, and this risk is not confined to history. On February 15-16, 2025, as part of a broader storm system that struck the southern West Virginia coalfields, the Guyandotte River at Logan crested at 28.07 feet -- the sixth-highest level on record, just eight feet under the all-time record of 35 feet. Damaged homes were spread across the county along the river rather than concentrated in one spot, four homes were declared a total loss, and Logan County was later added to the federal disaster declaration covering this event. The original forecast crest of 31 feet, which would have flooded the county's 911 center, fortunately did not materialize -- but the fact that the actual crest still ranked sixth-highest on record underscores that this is a real, recurring, present-day risk for hollow-terrain and riverside parcels throughout the county, not only near any specific legacy impoundment.