hillsborough County Bridge Inspections  

Florida Bridge Information - Hillsborough County

Laurel Street Bridge

Florida State Bridge Inspections
Health Index 1Sufficiency Rating 2
68.6 59.9

National Bridge Inventory Rating
Functionally Obsolete The term "functionally obsolete" only means that a bridge does not meet current road design standards. For example, some bridges are "functionally obsolete" because they were built at a time when lane widths were narrower than the current standard.

Bridge Information
Structure Status: Posted for other load-capacity restriction (speed, number of vehicles on bridge, etc.)
County: Hillsborough County
Owner: City or Municipal Highway Agency Maintenance Responsibility: City or Municipal Highway Agency
Roadway: Laurel Street Facility Crossed: Hillsborough River
Year Built: 1926 Reconstructed: 1969
Average Daily Traffic - State: 5,240
Average Daily Traffic - NBI: 5,240
Average Daily Truck Traffic - NBI: 262.0 (5 % of NBI Average Daily Traffic)
Future Average Daily Traffic - NBI: 6,550 in year 2030
Bypass, Detour Length: 1.2 mile
Toll System: On free road. The structure is toll-free and carries a toll-free highway.
Functional Classification: Expressways - Collector
Type of Service On the Structure: Highway-pedestrian
Lanes On the Structure: 4
Vertical Clearance Over Bridge Roadway: 0 feet
Type of Service Under the Structure: Waterway
Lanes Under the Structure: 0
Vertical Clearance Under Bridge Roadway: Feature not a highway or railroad, 0.00 feet
Historical Significance: Bridge is possibly eligible for the National Register of Historic Places (requires further investigation before determination can be made) or bridge is on a State or local historic register.
Last Inspection - State: March 29, 2014
Last Inspection - NBI: March, 2011
Designated Inspection Frequency (NBI): Every 24 Months

National Bridge Inventory Safety Feature
Bridge Median: No median
Bridge Railings: Inspected feature does not meet currently acceptable standards or a safety feature is required and none is provided.
Transitions: Inspected feature does not meet currently acceptable standards or a safety feature is required and none is provided.
Approach Guardrail: Inspected feature does not meet currently acceptable standards or a safety feature is required and none is provided.
Approach Guardrail Ends: Inspected feature does not meet currently acceptable standards or a safety feature is required and none is provided.

National Bridge Inventory Condition Ratings
Deck: SATISFACTORY CONDITION - structural elements show some minor deterioration.
Superstructure: FAIR CONDITION - all primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure: FAIR CONDITION - all primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and Channel Protection: Bank protection is in need of minor repairs. River control devices and embankment protection have a little minor damage. Banks and/or channel have minor amounts of drift.
Culverts: Not applicable. Use if structure is not a culvert.

National Bridge Inventory Operating Ratings: Load Factor (LF) - 4.31 tons
National Bridge Inventory Ratings: Load Factor (LF) - 2.98 tons

National Bridge Inventory Appraisal Ratings
Structural Evaluation: 5 - Somewhat better than minimum adequacy to tolerate being left in place as is
Deck Geometry : 2 - Basically intolerable requiring high priority of replacement
Underclear, Vertical & Horizontal : N - Not applicable
Waterway Adequacy : 7 - Better than present minimum criteria
Approach Roadway Alignment : 8 - Equal to present desirable criteria

Critical Feature Inspection
Fracture Critical Details: Y12
Underwater Inspection: Y24
Other Special Inspection: N

Cost Estimates
Bridge Improvement Cost: 0
Roadway Improvement Cost: 0
Total Project Cost (Year of Cost Estimate): 0 ()


1. The "health index" is a tool that measures the overall condition of a bridge. The health index typically includes about 10 to 12 different elements that are evaluated by the department. A lower health index means that more work would be required to improve the bridge to an ideal condition. A health index below 85 generally indicates that some repairs are needed, although it doesn't mean the bridge is unsafe. A low health index may also indicate that it would be more economical to replace the bridge than to repair it.

2. The "sufficiency rating" is a tool that is used to help determine whether a bridge that is structurally deficient or functionally obsolete should be repaired or just replaced. The sufficiency rating considers a number of factors, only about half of which relate to the condition of the bridge itself. The sufficiency ratings for bridges are part of a formula used by the Federal Highway Administration when it allocates federal funds to the states for bridge replacement.

Source: Office of Maintenance, Florida Department of Transportation (Last Update: April, 2013) & U.S. Department of Transportation

 
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