Bridges & Structural Engineering
Julington Creek / St. Augustine Road Bridge Replacement | Structural Engineering | Jacksonville, FL
CSI provided structural engineering design services for the replacement of an existing two-lane bridge over Julington Creek with a new four-lane bridge featuring a center turn lane, sidewalks, and dedicated bike lanes — delivered for the City of Jacksonville.
The replacement structure is a two-span, 104-ft bridge with AASHTO Type II pre-stressed concrete beams on a concrete pile-supported substructure. A key engineering challenge was maintaining two active 24-inch and 16-inch force mains in continuous service throughout construction — requiring precise utility accommodation within the bridge design.
Due to the close proximity of Phase I construction to the existing bridge, CSI utilized a mechanical splice system for reinforcement connections between construction phases. The proposed sidewalk served as a temporary travel lane during phased construction, with traffic barrier and parapet secured in stages using mechanical splices. Both permanent and temporary sheet pile systems were also designed for the project.
Key Engineering Work:
Four-lane bridge replacement with bike lanes and sidewalks
AASHTO Type II pre-stressed concrete beam superstructure
Concrete pile-supported substructure design
Active utility accommodation (24" and 16" force mains)
Mechanical splice system for phased construction
Permanent and temporary sheet pile design
Project Details
Client: City of Jacksonville
Location: Jacksonville, FL
Services: Structural Engineering | Bridge Design | Phased Construction Design
Project Engineers: Christopher Morse, PE | Scott Grimes, CBI
Pineville Road over Brushy Creek Bridge Replacement | Bridge Design | Escambia County, FL
CSI provided complete bridge replacement design services for the structurally deficient Pineville Road bridge over Brushy Creek in Escambia County, Florida — an FDOT-funded bridge replacement project.
The existing 61-ft, four-span timber stringer structure was replaced with a modern 92-ft, two-span bridge featuring 15-inch pre-stressed slab units with a 6-inch composite topping — selected following a preliminary structural analysis of multiple span arrangement alternatives.
Key Engineering Work:
Structural analysis of multiple span replacement alternatives
92-ft two-span bridge design (pre-stressed slab units with composite topping)
Bridge hydraulics analysis
Roadway design
Environmental permitting
Signing, pavement marking, and maintenance of traffic (MOT) plans
Construction cost estimates
Project Details
Client: Florida Department of Transportation (FDOT)
Location: Escambia County, FL
Services: Bridge Design | Roadway Design | Bridge Hydraulics | Environmental Permitting | Signing & Pavement Marking | MOT
Project Engineers: Ali Najafi, PE | Fares Tannous, PhD, PE | Eric Falkenberry, PE | Khaled Ramadan, PE
Main Street Bridge Safety Improvements | Bridge Inspection & Structural Design | Jacksonville, FL
CSI provided bridge inspection and structural engineering design services for safety improvements to the historic Main Street Bridge in Jacksonville, Florida — a 2,060-ft steel lift span bridge over the St. Johns River with a 365-ft lift span, owned by the Florida Department of Transportation (FDOT).
CSI designed modifications and full replacement of maintenance platforms and ladders on the lift span and towers to bring the structure into OSHA compliance while preserving its historic integrity. To protect the structure, CSI incorporated existing rivet holes in truss members to eliminate the need for welding or new drilling, and specified fiberglass composite catwalk members to minimize added load on the lift span.
Key Engineering Work:
Field investigation and structural condition assessment
OSHA-compliant maintenance platform and ladder design
Catwalk system design for lift span and tower structures
Fiberglass composite member specification to minimize dead load
Historic bridge preservation considerations
Structural plans production
Project Details
Client: Florida Department of Transportation (FDOT)
Location: Jacksonville, FL
Services: Structural Engineering | Bridge Inspection | Historic Bridge Rehabilitation
Project Engineers: Christopher Morse, PE | Scott Grimes, CBI
I-95 Bridge Widening | Bridge Widening Design | McIntosh County, GA
CSI provided structural engineering design services for the widening of four twin bridges on I-95 over tidal waterways in McIntosh County, Georgia — a Georgia Department of Transportation (GDOT) project expanding each structure from two lanes to four lanes.
The four structures — I-95 over Champney River (2,090 ft), Butler River (2,112 ft), Darien Creek (585 ft), and Cathead Creek (614 ft) — were widened on both the inside and outside using AASHTO Type II and III pre-stressed concrete beams, with substructure widening via additional pre-stressed concrete piles.
Special design considerations addressed trapezoidal span geometry, a concrete overlay of varying thickness to achieve the desired cross slope, and a concrete haunch on the underside of the deck at the tie-in. The Cathead Creek structure was further adjusted to incorporate a flare accommodating an on-ramp.
Key Engineering Work:
Inside and outside widening of four twin bridges (total spans: 5,401 LF)
AASHTO Type II and III pre-stressed concrete beam design
Pre-stressed concrete pile substructure widening
Concrete overlay design for cross slope correction
Trapezoidal span geometry accommodation
On-ramp flare design (Cathead Creek structure)
Project Details
Client: Georgia Department of Transportation (GDOT)
Location: McIntosh County, GA
Services: Structural Engineering | Bridge Widening Design
Project Engineers: Christopher Morse, PE | Scott Grimes, CBI
Omega El Dorado Road Bridge Replacement | I-75 Corridor Improvements | Tifton County, GA
CSI provided preliminary and final bridge design services for the Omega El Dorado Road bridge replacement as part of the I-75 corridor improvements in Tifton County, Georgia — delivered for the Georgia Department of Transportation (GDOT), District 4.
The 260-ft, two-span structure features AASHTO 72-inch Bulb-T pre-stressed beams with MSE walled abutments, and was designed for staged construction to maintain continuous traffic movement at the interchange throughout the project. CSI was also responsible for the full Mechanically Stabilized Earth (MSE) wall layout in addition to structural bridge design.
Key Engineering Work:
Preliminary and final bridge design (260 ft, two-span)
AASHTO 72-inch Bulb-T pre-stressed beam superstructure
MSE walled abutment design
Mechanically Stabilized Earth (MSE) wall layout
Staged construction sequencing for active interchange traffic maintenance
Project Details
Client: Georgia Department of Transportation (GDOT), District 4
Location: Tifton County, GA
Services: Structural Engineering | Bridge Design | MSE Wall Layout
Project Engineers: Ramesh Kalvakaalva, PE | Christopher Morse, PE
SR 3 (US 19) over SR 118 & Central of Georgia Railroad | Twin Bridge Design | Lee County, GA
CSI provided preliminary and final design services for new twin bridges carrying SR 3 (US 19) over SR 118 and the Central of Georgia Railroad in Lee County, Georgia — for the Georgia Department of Transportation (GDOT).
Each bridge is 291 ft long on a curved horizontal alignment, comprised of four spans — two 47.5-ft end spans and two 98-ft middle spans — carrying two 12-ft lanes with a 10-ft outside shoulder and a 4-ft inside shoulder. AASHTO 54-inch Bulb-T pre-stressed beams were used for the middle spans, with AASHTO Type II beams for the end spans. The substructure consists of reinforced concrete frame bents on 18-inch square pre-stressed concrete piles.
Key Engineering Work:
Twin bridge preliminary and final design (291 ft, curved alignment)
AASHTO 54-inch Bulb-T pre-stressed beam design (middle spans)
AASHTO Type II pre-stressed beam design (end spans)
Reinforced concrete frame bent substructure on prestressed concrete piles
Curved horizontal alignment geometry
Project Details
Client: Georgia Department of Transportation (GDOT)
Location: Lee County, GA
Services: Bridge Design | Structural Engineering
Project Engineers: Christopher Morse, PE | Scott Grimes, CBI
Greenfield Creek Box Culvert | Structural Engineering | Jacksonville, FL
CSI provided structural engineering and bridge design services for a concrete box culvert spanning Greenfield Creek in Jacksonville, Florida — designed in association with the widening of Hodges Boulevard from one lane to two lanes in each direction, for the City of Jacksonville.
The 108-ft structure consists of two 10 ft × 5 ft concrete box cells spanning approximately 22.5 ft across Greenfield Creek, with associated headwalls, cut-off walls, and wingwalls. Design required careful coordination with an adjacent 48-inch diameter outfall pipe, an 18-inch RCP feeding transversely into the creek, and stormwater inlets — all accommodated within the culvert design.
Key Engineering Work:
108-ft concrete box culvert design (two 10'x5' cells)
Headwall, cut-off wall, and wingwall design
48-inch outfall pipe proximity accommodation
Transverse 18-inch RCP and stormwater inlet integration
Extended and reinforced wingwall adjacent to outfall opening
Composite endwall detail for 18-inch pipe accommodation
Project Details
Client: City of Jacksonville
Location: Jacksonville, FL
Services: Bridge Design | Structural Engineering
Project Engineer: Christopher Morse, PE
Beck's Lake Road over Unnamed Branch Bridge Replacement | Bridge Design | Escambia County, FL
CSI provided bridge replacement design services for the structurally deficient Beck's Lake Road bridge over Unnamed Branch Creek in Escambia County, Florida — an FDOT-funded project.
Following a thorough evaluation of both bridge and bridge-culvert section alternatives and a preliminary structural analysis, CSI recommended and designed a concrete cast-in-place box culvert replacement — replacing the existing 31-ft, two-span structure.
Key Engineering Work:
Structural evaluation of bridge and culvert section alternatives
Concrete cast-in-place box culvert design
Bridge hydraulics analysis
Roadway design
Environmental permitting
Signing, pavement marking, and maintenance of traffic (MOT) plans
Construction cost estimates
Project Details
Client: Florida Department of Transportation (FDOT)
Location: Escambia County, FL
Services: Bridge Design | Roadway Design | Bridge Hydraulics | Environmental Permitting | Signing & Pavement Marking | MOT
Project Engineers: Ali Najafi, PE | Fares Tannous, PhD, PE | Eric Falkenberry, PE | Khaled Ramadan, PE
E-1 Water Control Structure | Structural & Civil Engineering | Palatka, FL
CSI provided multidisciplinary structural, civil, hydraulic, and geotechnical engineering design services for the E-1 water control structure as part of the Sunnyhill Restoration Project — a historic Ocklawaha River basin restoration initiative managed by the St. Johns River Water Management District (SJRWMD).
The E-1 Structure is a single reinforced concrete box culvert (10 ft W × 6 ft H × 60 ft L) with headwalls, wingwalls, and an outflow spillway, crossing the U.S. Army Corps of Engineers (USACE) L-231 levee and discharging into the C-231 canal. The existing structure — two heavily corroded corrugated metal pipes, one of which had collapsed and caused a sinkhole within the levee — was replaced at a new location approximately 40 ft south, as in-place replacement was not feasible.
Because the L-231 levee serves as both a flood control structure and a critical access route for maintenance, construction, and emergency personnel, preserving the levee's structural integrity throughout design and construction was paramount. CSI coordinated closely with both SJRWMD and USACE, with design following U.S. Army Corps of Engineers guidelines throughout.
Key Engineering Work:
Geotechnical exploration and engineering analysis
Reinforced concrete box culvert design (10'x6'x60')
Headwall, wingwall, and outflow spillway design
Hydraulic engineering and water control structure design
USACE levee compliance and coordination
Site/civil design and plans & specifications production
Construction support services
Project Details
Client: St. Johns River Water Management District (SJRWMD)
Location: Palatka, FL
Services: Structural Engineering | Site/Civil Design | Hydraulic Engineering | Geotechnical Engineering
Project Engineer: Christopher Morse, PE
