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        "distance":1,
        "drainageArea":11419,
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        "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Allegheny 4 Lock and Dam in 1927 across the Allegheny River.  The dam is located near Natrona Pennsylvania, about 24 miles upstream of the confluence of the Allegheny and Monongahela Rivers in Pittsburgh, PA.  The purpose of the dam is to create a navigation pool from the dam to Allegheny 5 Lock and Dam, which is located near Freeport, PA. The dam consists of a concrete spillway section, which means that the river flows freely over it.  The lock provides a lift of about 11 feet, which is the height of the river level behind the dam above the river level downstream of the dam.  The lock allows river traffic to travel upstream or downstream of the dam.  The lock consists of a rectangular chamber that is 56 feet wide by 360 feet long and formed on each side by concrete walls and steel gates on the upstream and downstream sides.  The economic benefits of shipping materials and goods through the lock is more than 7 million dollars annually.  There are no means of controlling the flow over the dam and the dam does not provide the nearby communities any protection from flooding.  Local communities use the pool upstream of the dam for water supply.  The pool created by the dam provides recreation opportunities for metropolitan Pittsburgh.",
        "riskCharSummary":"The most recent risk assessment of the dam was performed in 2023, which characterized the risk as very low. The assessment identified one primary, but very unlikely scenario that could cause the dam to fail.  If the riverbed downstream of the dam were to erode deeply, a portion of the concrete dam could slide downstream and release the water in the pool upstream of the dam.  Although this scenario is very unlikely, it would most likely occur during a time of normal river levels.  If the pool upstream of the dam is released, river navigation would be halted, resulting in a loss of economic benefits to the region of more than 9 million dollars per year.  The economic damage would be temporary, until the upper pool could be restored to allow resumption of shipping, water supply, and boat recreation.  Although this scenario is possible, the dam has performed well for over 90 years without incident and there are no indications that the downstream riverbed is eroding in a manner that would threaten the dam.",
        "riskManagementMeasures":"To ensure we are taking all steps to reduce the risk to the public and the economy, we conduct emergency exercises with our external partners to improve communications and reactions in the event of an emergency that threatens the dam\u2019s upper pool or may adversely affect navigation.  We regularly update our emergency action plan.  We also communicate with the Coast Guard, the Waterways Association, and the shipping industry to keep them aware of conditions at the dam and any changes to lock operations.   We conduct routine monitoring and surveillance of the lock and dam, including periodic comprehensive inspections, the most recent of which was conducted in 2023.  Based on observations of possible riverbed erosion downstream of the dam after the 2018 inspection, USACE undertook a careful inspection of the area in 2020.  This inspection indicated that there has been no recent erosion at the dam.  We closely follow rainfall forecasts and river levels to determine when high river events may occur to provide information for any necessary public or industry notifications. Information on river levels and forecasts are available to the public via the internet at:  \n\nhttp://water.weather.gov/ahps2/forecasts.php?wfo=pbz",
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        "yearCompleted":1927,
        "congDist":"Congressional District 17, Pennsylvania",
        "city":"BRACKENRIDGE",
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