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        "public_name":"Illinois River OBrien LD",
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        "damHeight":null,
        "damLength":430,
        "distance":null,
        "drainageArea":250,
        "eapId":1,
        "dsacAssignedDate":"2018-05-14T12:00:00.000Z",
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        "emergencyContactsUpdated":"2025-01-31T12:00:00.000Z",
        "eapLastRevDate":"2005-04-30T12:00:00.000Z",
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        "federalId":"IL01013",
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        "hydraulicHeight":9,
        "inspectionAuthorityId":1,
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        "lengthOfLocks":1000,
        "secondaryLengthOfLocks":null,
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        "maxDischarge":2200,
        "maxStorage":9700,
        "nidHeight":37,
        "nidStorage":9700,
        "normalStorage":0,
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        "projectDescription":"Thomas J. (T.J.) O\u2019Brien Lock and Controlling Works is a navigation project located 326.0 miles above the confluence of the Illinois River with the Mississippi River at Grafton, Illinois. It is approximately 35 miles upstream of the Lockport Lock and Dam.  T.J. O\u2019Brien is located at the entrance to Lake Michigan in Chicago and is part of the Chicago Area Waterway System (CAWS).  The project is composed of a navigational lock, fixed dam, and controlling works.  USACE operates and maintains the navigational lock and fixed dam portions to allow passage between the CAWS and Lake Michigan, while the Metropolitan Water Reclamation District of Greater Chicago (MWRD) operates and maintains the controlling works to keep the water level on the riverside at -2.0 feet Chicago City Datum (CCD).   T.J. O'Brien is a low-lift sector gate lock and the lift varies from 0 to 5 feet from the Calumet River to Lake Michigan, depending on the lake level. The lock chamber is 1,000 feet long by 110 feet wide with two pairs of sector gates at both the river and lake ends; each of the gates weighs 216 tons.  Earth embankment dams extend approximately 2,000 feet east and 1,500 feet west of the lock.  The controlling works consist of four vertical slide gates (10 feet square) located near the center of the dam to regulate water flow. T.J. O\u2019Brien Lock and Controlling Works controls the movement of water between Lake Michigan and the Calumet River while maintaining navigation. The lock and dam are used for flood control and waterway flushing, and also function as components of the system used to regulate the Lake Michigan diversion.  Lake Michigan diversion involves accounting for withdrawals by the State of Illinois from the lake in accordance with the governing Supreme Court decree.  If flooding on the CAWS occurs, the MWRD will open the slide gates to allow water from the Calumet River to flow into Lake Michigan.  If the capacity of these sluice gates is insufficient, MWRD will instruct USACE to open the lock gates to increase the discharge capacity to minimize potential flooding on the CAWS .",
        "riskCharSummary":"There are two critical functions of the T.J. O'Brien Lock and Controlling Works. The primary function is to provide a navigation link between Lake Michigan and the Chicago Area Waterways (CAWS), which leads to the Illinois Waterway.  The other critical function is to allow backflow to Lake Michigan and reduce flood damages if flooding conditions on the Calumet River occur.  Also, the project provides protection from high lake levels in Lake Michigan from causing flooding downstream. Failure of the lock gates or structural failure of the lock would impact both navigation and the ability to release flood water.   If high lake levels occur, failure of the embankment dams to the east and west of the lock could result in downstream flooding.  Flood damages could result in inundation of over 3,000 structures in the area downstream in the southern part of the City of Chicago. Expected flood depths would be less than two feet.  If navigation was disrupted, potential economic damages of up to $10M (2017 estimate)  could occur if the lock was unable to be used for a 30-day period.",
        "riskManagementMeasures":"USACE staff are continuously on-site to operate and maintain the T.J. O'Brien Lock and Controlling Works.  USACE works closely with the Metropolitan Water Reclamation District (MWRD) to manage water levels to minimize flooding.  USACE staff conduct regular inspections and monitoring of the project, with increased frequency during high water conditions.  The project has an Emergency Action Plan (EAP) that USACE coordinated with MWRD, the City of Chicago Office of Emergency Management and Communication (OEMC), and the State of Illinois.",
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        "submitDate":"2023-10-24T16:03:33.893Z",
        "surfaceArea":0,
        "volume":4600,
        "widthOfLocks":110,
        "secondaryWidthOfLocks":null,
        "yearCompleted":1960,
        "congDist":"Congressional District 02, Illinois",
        "city":"CHICAGO",
        "county":"Cook",
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