The Club Forms and Lowers the Dam

The work crew cut the dam’s crest in the spring of 1881. Picks broke the packed earth along the top of the embankment. Shovels lifted it into wagons. The men hauled the material to the sides and spread it to widen the road. The crest dropped. The road widened. No engineer watched the work. No engineer measured what the lowering cost. The crew had one instruction: make the top wide enough for a carriage.

The dam had been built by the Commonwealth of Pennsylvania between 1838 and 1853 as part of a cross-state canal system, the Main Line of Public Works. As railroads superseded canal barge transport, the Commonwealth abandoned the canal and sold it to the Pennsylvania Railroad in 1857. The railroad had no operational use for a reservoir in a valley above a small town called South Fork. The reservoir sat. The dam sat. The property sat on the railroad’s books as a line item.

In late 1879, a group of Pittsburgh manufacturers and financiers incorporated the South Fork Fishing and Hunting Club. They organized under Pennsylvania law. They issued stock. They elected officers. They wanted a private retreat for fishing and summer recreation on the old reservoir. They purchased rights from the Pennsylvania Railroad, which had inherited the canal properties after the state abandoned the system. The deed transferred the property. The deed did not mention the dam’s condition. The deed did not transfer any obligation to maintain the structure. The railroad sold the property and moved on. The club bought it for pleasure.

The men who formed the club were not engineers. They were financiers, manufacturers, and executives. Many were connected through business and social ties to Carnegie Steel. They wanted a lake. They wanted a clubhouse on the hillside above the water. They wanted cottages. They wanted a carriage road across the dam to reach their grounds. They wanted fish in the water and screens to keep the fish from escaping. They got an aging earthwork dam holding back a reservoir that had been partially drained, abandoned, and left without maintenance for years.

The club’s minutes recorded the business of the organization. The minutes recorded the decision to purchase the reservoir property. They recorded the decision to build a clubhouse. They recorded the decision to build cottages. They recorded the decision to stock the lake with fish. They recorded the decision to build a road across the dam. They did not record the decision to lower the dam crest. They did not record the decision to install fish screens. They did not record the decision to patch leaks with mud, straw, and manure. These were operational choices, made by club employees or contractors, not entered in the club’s minutes. The minutes recorded what the club wanted to remember. The structure of the dam remembered what the club forgot.

The first modification was the lowering of the crest. The club cut down the top of the dam to widen it for a carriage road. The original embankment had a crest wide enough for maintenance access. The club wanted more width. The simplest method was to excavate the top and use the material to widen the roadbed. The crew did this with picks, shovels, and wagons. They lowered the crest by as much as three feet. A hydraulic analysis published in 2016 confirmed the reduction and found that it directly reduced the dam’s ability to withstand major storms.

Freeboard is the vertical distance between the normal water level and the top of the dam. It is the margin of safety. It is the space the reservoir has to absorb floodwater before water flows over the top. Three feet of freeboard was the difference between a dam that could absorb an extraordinary storm and one that could not. The club consumed that margin for a road.

The second modification was the installation of fish screens at the spillway outlets. The club had stocked the lake. The club did not want the fish to escape through the spillway. The screens were iron grates or mesh placed across the discharge points. They served the club’s purpose. They also served a function the club did not intend. During high water, the screens trapped debris. Branches, logs, leaves, and sediment carried by storm runoff accumulated against the mesh. The accumulation blocked the spillway. A blocked spillway could not discharge water. A spillway that cannot discharge is not a spillway. It is a wall.

The spillway was the dam’s only means of controlled release. The original design included discharge pipes at the base of the dam, equipped with valves that could be opened to drain the reservoir. Those pipes had been removed or had deteriorated beyond use. The club did not replace them. The club did not install new valves. The club needed the reservoir full, because a full reservoir was a lake. Without the discharge pipes, the spillway was the sole mechanism for preventing the reservoir from rising beyond the dam’s capacity. When the screens blocked the spillway, the dam had no means of controlled release at all.

The third modification was the method of repair. The dam leaked. Earth dams leak. The question is whether the leakage is managed. The original construction included a puddled clay core, a vertical wall of compacted clay inside the embankment designed to slow seepage. The core had deteriorated. The embankment had settled. Water found paths through the structure. The club patched the leaks with mud, straw, and manure applied to the upstream face. These materials were available on site. They were cheap. They were temporary. Mud washes away. Straw rots. Manure decomposes. The patches addressed the visible symptom. They did not address the structural cause. They did not restore the clay core. They did not seal the seepage paths. They held for a season. Then they needed to be reapplied.

A hydraulic analysis published in 2016 confirmed that the changes made to the dam by the South Fork Fishing and Hunting Club severely reduced its ability to withstand major storms. Lowering the dam by as much as three feet and failing to replace the discharge pipes were the two most consequential modifications. The fish screens compounded the problem by blocking the spillway during high water. The mud patches were a third failure layer. Each modification was a choice. Each choice served the club’s purpose. Each choice reduced the dam’s safety margin. The choices accumulated in the structure of the dam itself, in the earth and the iron and the mud, in the height of the crest and the width of the spillway and the absence of the pipes.

The work proceeded without engineering plans. No professional engineer supervised the modifications. No public authority reviewed them. No permit was required. The Commonwealth had washed its hands of the reservoir when it sold the Main Line. The railroad had no obligation to inspect a structure it no longer operated. The club, as a private entity on private land, answered to no one. The Pennsylvania Board of Canal Commissioners no longer existed. The borough of South Fork had no jurisdiction over a private dam. Cambria Iron, which operated the mills in Johnstown fourteen miles downstream, did not own the dam and had no authority to inspect it. The modifications were private decisions on private property. The consequences, if the dam failed, would be public.

The club’s ledger recorded the cost of the clubhouse. It recorded the cost of the cottages. It recorded the cost of the road. It recorded the cost of the fish and the boats and the servants. It did not record the cost of the three feet of earth cut from the dam’s crest. It did not record the cost of the discharge pipes not replaced. It did not record the cost of the fish screens that would block the spillway. These were not costs in the club’s accounting. They were costs in the dam’s structure. The club’s ledger was an absentee ledger. It recorded private benefits. It did not record public risks. The benefits accrued to the club’s members in Pittsburgh. The risks accrued to the valley below.

The valley below was Johnstown. It sat at the confluence of the Little Conemaugh and Stony Creek. It was a manufacturing town. Cambria Iron operated its mills there. The Pennsylvania Railroad ran its main line through the valley. The town had grown since the canal era because the railroad built shops there and Cambria Iron built mills there and the coal seams around it were thick and accessible. The town had approximately thirty thousand people. They lived below the dam. They did not own the dam. They did not control the dam. They did not know what the club had done to the dam. The dam was fourteen miles upstream, in a valley they could not see from their streets.

The dam had held for decades. The club’s defenders would later point to this fact. The dam had held since the 1850s. It had held through storms. It had held through the years of canal operation and the years of abandonment. It held because the original construction, despite its flaws, had included enough margin. The freeboard was generous. The spillway, while narrow, was unobstructed. The discharge pipes, while primitive, functioned. The dam held because it had been built to hold more water than the reservoir typically held. The dam held because it had a margin of safety.

The club consumed that margin. The three feet of lowered crest consumed the freeboard. The fish screens consumed the spillway capacity. The missing discharge pipes consumed the controlled release. The mud patches consumed nothing. They simply failed to address the seepage. The margin was gone. The dam still held. It held because no storm had yet tested it. It held because the reservoir was not full. It held because no debris had yet accumulated against the screens. It held by default. It held because the conditions that would break it had not yet arrived.

The conditions would arrive. They would arrive in May 1889. A storm would drop unprecedented rain on the Little Conemaugh watershed. The reservoir would fill. The screens would clog. The spillway would fail to discharge. The water would rise to the lowered crest. It would flow over the top. The earth embankment, saturated and patched with mud, would dissolve. The dam would fail. The water would take fifty-seven minutes to reach Johnstown.

The club did not foresee this. The club’s members were not engineers. They did not calculate the freeboard. They did not model the spillway capacity. They did not analyze the seepage. They consulted their own needs. They needed a wider road. They needed to keep their fish. They needed to patch the leaks. They needed to keep the lake full. They did what they needed to do. They did not do what the dam needed.

The dam needed a higher crest. It needed a wider spillway. It needed functioning discharge pipes. It needed a restored clay core. It needed engineering review. It needed maintenance that addressed structure, not appearance.

The dam needed things that cost money and produced no visible return. The club spent its money on things that produced visible returns. The clubhouse was visible. The cottages were visible. The road was visible. The fish were visible. The mud patches were visible.

The lowered crest was visible, but its consequence was invisible. The consequence was a number. The number was the freeboard. The freeboard was the distance between the water and the top of the dam. The distance had been reduced. The reduction was three feet. Three feet of earth, removed for a road, was the margin between a dam that held and a dam that failed.

The club’s members were wealthy men. They could afford the repairs. The clubhouse cost money. The cottages cost money. The road cost money. The fish cost money. The labor to lower the dam crest cost money. The labor to install fish screens cost money. The mud and straw and manure for patches cost money. The club spent money on all of these things.

The club did not spend money on engineering review. It did not spend money on a wider spillway. It did not spend money on new discharge pipes. It did not spend money on a restored clay core. It spent money on the things that made the club pleasant. The pleasant things were recorded in the ledger. The structural things were not.

This was the deferred-maintenance debt. The cost of the repairs the club did not make accumulated in the dam’s structure. The earth settled. The clay core deteriorated. The spillway narrowed with debris. The crest stayed low. The discharge pipes stayed missing.

The debt grew. The ledger did not show it. The ledger showed the clubhouse and the cottages and the fish. The ledger showed a successful club. The dam showed a failing structure. They were the same property.

The club’s first season was 1881. The lake was full. The clubhouse was open. The cottages were occupied. The road across the dam carried carriages. The fish were stocked. The screens were in place. The mud patches held. The dam held. The season was a success.

The club’s members drove their carriages across the lowered crest. They fished in the stocked lake. They ate at the clubhouse. They slept in the cottages. They did not think about the dam. The dam was the ground they drove on. It was the edge of the lake. It was scenery. It was the base of their pleasure.

They did not see the structure beneath the road. They did not see the earth that had been cut away. They did not see the spillway screens clogging with leaves. They did not see the seepage paths opening inside the embankment. They did not see the freeboard reduced to a number that would not survive a storm.

They saw the lake. They saw the clubhouse. They saw the road. They saw their own comfort.

The structure was invisible. The structure was the dam. The dam held. The dam held because the storm had not come.

The Pennsylvania Railroad’s role was transactional. The railroad had acquired the canal properties from the Commonwealth in 1857, when the state sold the Main Line of Public Works. The railroad bought the entire system, including the reservoir, the dam, and the canal bed. The railroad converted the canal towpath into a rail bed where practical. The reservoir was not on a rail line. The railroad held the property for years. It paid taxes on it. It did not maintain the dam. It did not inspect the dam. It did not repair the dam.

The dam was a line item. When the club offered to buy it, the railroad sold it. The deed was a property transaction. The dam was property. The property changed hands.

The responsibility did not change hands, because no party had defined it. The Commonwealth had built the dam. The Commonwealth had abandoned it. The railroad had inherited it. The railroad had sold it. The club had bought it.

At no point did any party assume responsibility for the dam’s structural integrity. At no point did any party inspect the dam and certify its safety. At no point did any party calculate the consequences of failure.

The dam passed from owner to owner like a piece of land. It was not a piece of land. It was a barrier holding back a lake. The barrier had been modified. The modifications had reduced its capacity. The capacity was a number. The number was decreasing.

The club’s modifications were complete by 1881. The dam had been lowered. The road had been widened. The fish screens had been installed. The leaks had been patched. The discharge pipes had not been replaced. The spillway had not been widened. The clay core had not been restored. No engineer had reviewed the work. No public authority had inspected it. No law required either. The dam was private property. The modifications were private choices. The structural consequences were accumulating. The freeboard was reduced. The spillway capacity was reduced. The controlled release capacity was eliminated. The seepage management was inadequate. Each reduction was a number. The numbers were decreasing. The numbers were the dam’s margin of safety. The margin was the difference between holding and failing. The margin was shrinking. The margin was invisible. The margin was not in the ledger. The margin was in the earth.

The bill would be paid by the valley. The valley did not know the bill existed. The valley was Johnstown. Johnstown was fourteen miles downstream. Johnstown had thirty thousand people. Johnstown had Cambria Iron. Johnstown had the Pennsylvania Railroad. Johnstown had streets and houses and schools and churches. Johnstown had no knowledge of the modifications to the South Fork Dam. The dam was private property. The modifications were private decisions. The consequences were public. The disconnect was total.

The people who made the decisions were in Pittsburgh. The people who would pay for the decisions were in Johnstown. The people who made the decisions did not live below the dam. The people who would pay for the decisions did live below the dam. The ledger was in Pittsburgh. The cost was in the dam. The dam was above Johnstown. Johnstown was below the dam. The water was between them. The water would go down.

The dam held. The lake was full. The clubhouse was open. The season was pleasant. The ledger balanced. The dam had been structurally altered for club convenience, its safety margin reduced without any external review.