Esri ArcGIS Online (AGOL) Feature Layer which provides access to the Maryland Bridge / Structures data product.Maryland Bridge / Structures data consists of point & linear geometric features which represent the geographic location & extent of bridge / structures along roadways throughout the State of Maryland. Maryland Bridge Structures data is owned & maintained by the MDOT SHA Office of Structures (OOS). Maryland Bridge Structures data is used by various transportation business units within MDOT, as well as many other Federal, State, & local government agencies. Maryland Bridge Structures data is key to understanding more about the bridge structures along roadways throughout the State of Maryland. Maryland Bridge / Structures data is updated daily by the MDOT SHA Office of Structures (OOS). Those updates are comprehensively published on a monthly routine basis. For additional information, contact MDOT SHA OIT Enterprise Information Services: Email: GIS@mdot.maryland.gov

DownloadA daily extract of the NPDES Structures dataset is available for download as a zipped file geodatabase.BackgroundAs a government agency that owns and maintains separate storm sewer systems, the Maryland State Highway Administration (SHA) is mandated to file a National Pollutant Discharge Elimination System (NPDES) permit with the Maryland Department of the Environment (MDE). The permit requires the inventory, inspection, and maintenance of SHA stormwater infrastructure. SHA is responsible for maintaining storm drain infrastructure on more than 5,000 miles of roadway statewide. SHA has developed a program consisting of SHA personnel, data managers, and subject matter experts to support the permit requirements and maintain these roadways. The tasks involved in the SHA NPDES data collection program are often completed by engineering consultants for SHA. The data are organized into a series of drainage systems with stormwater management facilities that are interconnected, allowing for flow-tracing function through distinct systems. A drainage system is defined as a series of storm drain structures or point features (i.e., manholes, inlets, endwalls) that connect hydraulically through conveyance features such as pipes and / or ditches. Closed and open storm drain structures are connected by pipe and ditch conveyance to create the drainage system. Stormwater management facilities (SWMF), also known as stormwater best management practices (BMP) are inventoried with the storm drain system. A system can include both open and closed storm drain features. StructuresPhysical stormwater structures to be identified and inventoried include headwalls, endwalls, cross culverts, pumping stations, stormwater risers and weirs, inlets, pipe connections, and manholes. Storm drain structures are represented as point features in the database. Several database features are included that are not existing physical structures, but are employed to facilitate connection of drainage systems in the database. For detailed descriptions of each feature, refer to the SHA Book of Standard for Highway & Incidental Structures, Category 3 “Drainage.” Storm drain structures within SHA ROW are inventoried. Information on private storm drain structures will need to be collected if a private system ties into SHA-owned storm drain features. The only structures that are not inventoried within SHA ROW are single residential driveway culvert end structures (See below for more details), bridge inlets, under drains, roof drainage, or other private tie-ins with the exception of the first or last structure from a private storm drain system and curb opening. If an under-drain pipe has an end structure (such as an endwall), then the structure is inventoried. Curb openings are only inventoried when affecting the drainage area for a BMP or major outfalls. If it is deemed necessary to include a curb cut in the database, the curb cut is captured as an inlet feature with comments identifying the feature as a curb opening. A curb opening is not a COG or COS inlet with an open back, but simply a cut in the curb where sheet flow is exiting impervious. The following are brief discussions of the structures in the data. See Chapter 2 of the Maryland SHA Stormwater NPDES Program SOP for more information, figures, and descriptions of each field. End / Head StructuresAn end / head structure is any structure at the upstream or downstream end of a culvert or pipe. These can include headwalls, endwalls, end sections, and projection pipes. Often the end / head structure is designated on the contract sheets and field verified. When contract plans are not available for a roadway, the SHA Book of Standard for Highway & Incidental Structures should be referenced if structure types are unfamiliar with field teams. Outfall areas are not to be inventoried, but will be analyzed during the inspection process. Headwalls (HW) are structures that are placed at the upstream end of pipes and culverts to provide a stable or hydraulically desirable entrance to the conveyance. Headwalls are usually concrete but can be constructed of wood or masonry, such as brick or concrete block. Wall structures on the upstream side of a culvert or pipe are inventoried as headwalls. Plan sheets may designate the upstream end of a pipe or culvert as an endwall, but these structures should be inventoried as headwalls. All wall-end structures at the upstream end of a pipe or culvert should be inventoried as headwalls. Endwalls (EW) are structures that are placed at the downstream end of pipes and culverts to provide a stable or hydraulically desirable exit to the conveyance. Endwalls are usually concrete, but can be constructed of wood or masonry such as brick or concrete block. All wall structures on the downstream side of a culvert or pipe are inventoried as endwalls. Plan sheets may designate the downstream end of pipe or culvert as a headwall, but these structures should be inventoried as endwalls. All wall-end structures at the downstream end of a pipe or culvert should be inventoried as endwalls. End Sections (ES) are structures that transition the ends of pipes into slopes and provide stability to the pipe entrances and outflows. End sections do not affect the hydraulic capacity or efficiency of the pipes. End sections can be constructed of concrete, metal, or plastic (HDPE). End sections can either be inventoried at the upstream or downstream end of a pipe. Projection Pipes (PP) are not physical structures but represent the upstream and downstream end of a pipe if an end structure on a pipe does not exist. Projection pipes are captured spatially as a feature and represent the ends of pipes. Inlet StructuresInlets are structures that collect storm drain runoff. Inlets convey the runoff to closed storm drain systems, open conveyance, or outfalls. There are many different types of inlet structures, and all are discussed in the SHA Standard Design Manual and should be reviewed prior to conducting an inventory. Spring heads are also inventoried as inlets. Inlets (IN) are hydraulic structure chambers below surface grade that collect storm drain runoff. An inlet either has a grate or open sides / curb to allow runoff to enter the storm drain system. Inlets are often constructed of concrete, masonry brick, or concrete block. Spring Heads (SH) are inventoried as inlets. Spring heads are inventoried only where they emerge and are connected to a storm drain system. Spring heads are inventoried because they provide evidence for the presence of ground water for dry weather flows during illicit discharge field screening operation. Spring heads may be identified from contract drawings or identified during the field inventory. Spring heads are mostly found in rural areas. Connection StructuresA connection structure is a storm drain structure that connects conveyance (pipes and ditches) within a system and is not an inlet, riser, weir, or pumping station. These can include manholes, ditch intersections, junction boxes, pipe connections, wye connections, capped inlets, pipe bends, and pipe directions. Because field crews are not required to open manhole lids and enter closed storm drain structures, no designation type is necessary for connection structures. All of the attribute data for these structures will be collected from contract drawings, including connection material and top of manhole elevations. The existence of connection structures should be field verified for spatial accuracy, even though the attributed data will be collected from contract drawings. For structures that are buried or paved over, a GPS point is to be recorded at the best estimated location in the field based on contract plan sheets. The verification of attribute table data for structures that cannot be verified in the field will be completed based on plan sheet information. This also holds true for structures that are buried or cannot be accessed; the attribute data should be obtained from plan sheets. Manholes (MH) are hydraulic structures that connect pipes through a system. They are used as access points to a system, to change direction or invert elevations for pipes, as a junction to change pipe size and / or material, and as a junction of multiple pipes to a single pipe. Manholes are frequently paved over or buried, but are still inventoried. Unless it is certain that the manhole does not exist, the manhole is inventoried. Manholes with lids that have designed holes to allow runoff to enter are inventoried as manholes and not inlets. Ditch Intersections (ID) are geographic representations of where ditches meet, begin, or end a system and are captured as point features. These features are used to define the extents of ditches. Junction Boxes (JB) are underground hydraulic structures that connect pipes through a system. They are used to change direction or invert elevations for pipes, to change pipe size and / or material, and to connect multiple pipes to a single pipe. Identifying junction boxes in the field is difficult because these structures are usually buried with no part of the structure exposed to the surface. Junction boxes are only inventoried from contract drawings and should never be assumed in the field, unless the field crew is certain the structure is a junction box. If the field crew suspects that pipes are merging together and no contract plans are available to confirm this, the connection should be inventoried as a pipe connection and not a junction box. Pipe Connections (PC) are locations throughout the conveyance of a system where two or more pipes connect. A pipe connection is also captured at the location where a closed storm drain pipe connects to a culvert or stream crossing. Wye Connections (YC) are hydraulic structures that join two pipes together within a system’s conveyance. Wye connections will be identified from contract drawings and should not be assumed in the field. Instead of assuming a wye

The MDOT SHA OOTS Sign Structures dataset is an actively maintained database of sign structures in Maryland. The Maryland Department of Transportation, State Highway Administration, Office of Traffic Safety "OOTS" built and maintains the database with help from the MDOT SHA Office of Information Technology. Sign Structures in this open data database are only those set to an active* status. Structures information is further described by detailed attributes; the attributes definitions are listed below in the Data Dictionary section.Points of ContactData Owner: Faramarz "Faz" Sadeghi-Bajgiran for OOTS fbajgiran@mdot.maryland.govData Steward: Elliott Plack for OIT EISD: eplack.consultant@mdot.maryland.gov Technical Support: MDOT SHA OIT Enterprise Information Services - GIS Team: GIS@mdot.maryland.govData DictionarySign structure data are described by a number of attributes, including general ones, inspection details, and more.Str. ID: the Structure ID, a six-digit identifier. The first two digits represent the county. The last four digits are sequential.Status: the structure's status. Most structures are marked active. Structures with a "CFR" status are noted as "Call For Removal" and a slated to be removed or replaced in the noted time period.eDR Number: e-Design Number:Str. Type: the structure type, based on the design. Structures can either be cantilevered (CN), overhead (OH), or a combination (CM).Owned by: the owner. Most are owned by MDOT SHA but certain special ones are owned by another state agency, a federal agency, e.g., NPS, or the tri-state compact, the Woodrow Wilson Bridge Commission.Maintained by: the agency responsible for maintaining/inspecting the structure. Usually, the same as owner but some structures have unique maintenance agreements.Acceptance Year: the year the structure was accepted into the state inventory and a good estimate of the age.End-of-Service: a future year in which the structure should be removed based on criteria.Removal Year: the year the structure was removed, in the case of inactive structures.Inspection ParametersStructures are repeatedly inspected as they are critical assets for navigation and would adversely affect the public if they were to fall. The inspections are closely monitored by OOTS. Inspections are categorized by In-Depth, Routine, or NDT (Non-Destructive Testing). Each inspection regime has the same attributes:Frequency: frequency in which inspections are due.Status: status of the current inspection cycle.CRS: Component Rating Score. A comprehensive, weighted rating score the considers each component of the sign.RAS: Risk Assessment Score: A criticality score based on criteria like traffic volume, speed limit, age, type, and proximity to critical infrastructure.CRS Date: The most recent CRS date.Due Date: The due date of the next inspection of the type.MOT: Maintenance of Traffic (MOT) procedures recommended for the particular structure.Other AttributesDMS ID: if there is a Dynamic Message Sign on the structure, the ID will be listed.# of AB's / Pole: Number of Anchor Bolts per Pole. The number varies by structure type. A reference to the numbering regime is here.AB Dia.: Anchor Bolt diameter in US inches.Span: the span is the length of the structure, in US feet. Span is the distance between posts or from the post to tip for cantilever structures.Clearance: the clearance underneath the structure in US feet.Cross Section Type: the cross-section type of the pole, typically round but there are other less common types.Contractor: the contractor that installed the structure, if known.Contract No: the contract under which the structure was installed.Manufacturer: the manufacture of the structure.Shop Drawings Exist: whether or not the shop drawings exist within MDOT SHA.B-2-P Connection: Base-to-Plate connection typeB-2-P Gusseted: Whether or not the Base-to-Plate is gusseted.TEDD Comments: comments made by the Traffic Engineering Design Division in OOTS. Contact OOTS with any questions.Creator/Editor: There are several automatic fields that track the username that create and last updated the asset, and at what time.Inactive Structures* Inactive structures, e.g., those that have been removed, are also captured in this database but that information is not available here. Contact OOTS if interested in inactive structures.

Bridges on MDOT State Maintained Highways with Vertical Clearances less than 14 Feet 6 Inches. Harbor Tunnel Clearance - 14' Maximum Allowable Height of Vehicle and Load 13'. The vertical clearance limitations shown on are not guaranteed. Due to resurfacing of highways etc. these are subject to change and may be greater at certain positions under a structure. If dimensions are to be used to determine routes for exact movement, field measurements will be necessary. Structures with weight limits are stated for those structures on the State of Maryland Highway System that cannot carry legal weight vehicles. If you need to move an overweight load into or through Maryland please call 1-888-375-1084 for assistance.Bridge under clearances over navigable waterways are estimated vertical distances above normal water surface levels. For all movable bridges; the under clearance shown is for a bridge in a closed condition. These levels can vary considerably from season to season and for tidal waters will vary daily. Underclearance for tidal waters is above mean high tide. Therefore, because of these variations the elevations are provided as a service to the public as a guide and the information should be verified by field measurements by the boater if the exact under clearance is critical to the boater. SHA does not accept liability for inaccurate information.Click here for schedule of opening and closings