page_title: List of state highways in Maryland shorter than one mile (2–699)
section_title: MD 591
hierarchical_section_title: List of state highways in Maryland shorter than one mile (2–699) / MD 591
caption_attribution_description: English: View east along Maryland State Route 591 (Colora Road) at U.S. Route 1 (Conowingo Road) in Richardsmere, Cecil County, Maryland
context_page_description: The following is a list of state highways in Maryland shorter than one mile in length with route numbers between 2 and 699. Most of these highways act as service roads, old alignments of more prominent highways, or connectors between one or more highways. Many of these highways are unsigned and have multiple segments with the same number. Several of these highways have their own articles; those highways are summarized here and a link is provided to the main article. This list does not include highways where at least one highway of that number is at least one mile in length. All highways at least one mile in length have their own article. The highways shorter than one mile with the same number are covered in the main article for the highway.
context_section_description: Maryland Route 591 is the designation for a pair of state highways parallel to U.S. Route 1 on either side of Octoraro Creek near Conowingo in northwestern Cecil County.
  MD 591A is named Colora Road. The 0.28-mile-long (0.45 km) route extends from an oblique intersection with US 1 opposite Connelly Road to a barrier on the north side of Octoraro Creek.
  MD 591B is named Porters Bridge Road. The 0.80-mile-long (1.29 km) highway extends from a barrier on the south side of Octoraro Creek, just east of which the route crosses Love Run, to a tangent intersection with US 1.
  The first bridge at Richardsmere was constructed to serve Richard Porter's mill on the northwest side of Octoraro Creek in the late 18th century. A wooden covered bridge was constructed at the site around 1858 and washed away in a flood in 1884. A metal Pratt through truss bridge was constructed to replace Porter's Bridge in 1885. This truss bridge served the original state road, later designated US 1 in 1927. The state road west toward Conowingo was paved in 1911, and the state road east toward Rising Sun was completed by 1919. MD 591 was assigned to the route using Porters Bridge after US 1 was relocated and a new bridge upstream from Porters Bridge was completed in 1934. Porters Bridge was closed in January 1978 after a storm caused irreparable damage to the eastern approach to the bridge. The severely deteriorated bridge was scheduled to be dismantled in 2001.
caption: MD 591A eastbound at US 1 near Conowingo
exif: {"Image Make": "Apple", "Image Model": "iPhone 6", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "8.1.1", "Image DateTime": "2017:08:12 14:00:32", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "204", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[39, 41, 532/25]", "GPS GPSLongitudeRef": "W", "GPS GPSLongitude": "[76, 7, 5887/100]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "21635/612", "GPS GPSTimeStamp": "[18, 0, 3207/100]", "GPS GPSSpeedRef": "K", "GPS GPSSpeed": "0", "GPS GPSImgDirectionRef": "T", "GPS GPSImgDirection": "27957/112", "GPS GPSDestBearingRef": "T", "GPS GPSDestBearing": "30283/435", "GPS GPSDate": "2017:08:12", "Image GPSInfo": "1584", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1968", "Thumbnail JPEGInterchangeFormatLength": "11359", "EXIF ExposureTime": "1/1883", "EXIF FNumber": "11/5", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "32", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2017:08:12 14:00:32", "EXIF DateTimeDigitized": "2017:08:12 14:00:32", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "10879/1000", "EXIF ApertureValue": "7983/3509", "EXIF BrightnessValue": "12352/1257", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, auto mode", "EXIF FocalLength": "83/20", "EXIF SubjectArea": "[1631, 1223, 1795, 1077]", "EXIF SubSecTimeOriginal": "269", "EXIF SubSecTimeDigitized": "269", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "3264", "EXIF ExifImageLength": "2448", "EXIF SensingMethod": "One-chip color area", "EXIF SceneType": "Directly Photographed", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF FocalLengthIn35mmFilm": "29", "EXIF SceneCaptureType": "Standard", "EXIF LensSpecification": "[83/20, 83/20, 11/5, 11/5]", "EXIF LensMake": "Apple", "EXIF LensModel": "iPhone 6 back camera 4.15mm f/2.2"}