page_title: Hog's Back Bridge
hierarchical_section_title: Hog's Back Bridge
caption_attribution_description: English: Looking out into Mooney's Bay, from the Rideau Canal in Ottawa. .
context_page_description: The Hog's Back Bridge is an asymmetrical swing bridge over the Rideau Canal in Ottawa, Ontario. It carries 2 lanes of Hog's Back Road and a sidewalk. The bridge still swings in the summer when boats exceeding 9 feet in height need to pass.
  The bridge is hydraulically controlled. 2 wedge cylinders lock the bridge and raise the overhanging edge in place at road level. When the bridge is to be opened, from the control box up at bridge deck level, the bridge operator, who is with Parks Canada, lowers all 4 gates to block traffic from entering the bridge deck. The operator withdraws the 2 wedge cylinders which brings the bridge down a few inches and balanced onto a circular rail track. This movement also takes the weight of the bridge off the West side bridge bearings. Once the limit switches sense the wedge cylinders are fully retracted the operator can swing the bridge which is performed by 2 large hydraulic cylinders below the bridge on either side of the main bridge spindle. The hydraulic power unit has 2 main pumps which can be run independently or together, and one small backup pump to be run off a generator if need be.
context_section_description: The Hog's Back Bridge is an asymmetrical swing bridge over the Rideau Canal in Ottawa, Ontario. It carries 2 lanes of Hog's Back Road and a sidewalk. The bridge still swings in the summer when boats exceeding 9 feet (2.7 m) in height need to pass.
  The bridge is hydraulically controlled. 2 wedge cylinders lock the bridge and raise the overhanging edge in place at road level. When the bridge is to be opened, from the control box up at bridge deck level, the bridge operator, who is with Parks Canada, lowers all 4 gates to block traffic from entering the bridge deck. The operator withdraws the 2 wedge cylinders which brings the bridge down a few inches and balanced onto a circular rail track. This movement also takes the weight of the bridge off the West side bridge bearings. Once the limit switches sense the wedge cylinders are fully retracted the operator can swing the bridge which is performed by 2 large hydraulic cylinders below the bridge on either side of the main bridge spindle. The hydraulic power unit has 2 main pumps which can be run independently or together, and one small backup pump to be run off a generator if need be.
caption: The Hog's Back Bridge partially open.
exif: {"Image ImageDescription": "", "Image Make": "SONY", "Image Model": "DSC-H5", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2006:07:29 17:11:51", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "256", "Image PrintIM": "[80, 114, 105, 110, 116, 73, 77, 0, 48, 51, 48, 48, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail Make": "SONY", "Thumbnail Model": "DSC-H5", "Thumbnail Orientation": "Horizontal (normal)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail DateTime": "2006:07:29 17:11:51", "Thumbnail JPEGInterchangeFormat": "2952", "Thumbnail JPEGInterchangeFormatLength": "11459", "EXIF ExposureTime": "1/200", "EXIF FNumber": "4", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "125", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2006:07:29 17:11:51", "EXIF DateTimeDigitized": "2006:07:29 17:11:51", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "8", "EXIF ExposureBiasValue": "17/10", "EXIF MaxApertureValue": "3", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire, auto mode", "EXIF FocalLength": "6", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "3072", "EXIF ExifImageLength": "2304", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "2746", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Manual Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal"}