LAKE CHABOT ROAD
Repair Status Update
November 6, 2024
November 6, 2024 Facilities and Transportation Committee Meeting 1 1 Agenda
Background and Storm damage
Staff Recommendation
2 3
9/9/24 City Council Meeting Requests
November 6, 2024 Facilities and Transportation Committee Meeting 2 Background and
Storm Damage
1 November 6, 2024 Facilities and Transportation Committee Meeting 3
LAKE CHABOT ROAD
November 6, 2024 Facilities and Transportation Committee Meeting 4 Cracks/fissures due to road instability
• 0.5 miles in San Leandro
• 1.8 miles in County
• 3500 vehicles per day (2018)
• 32’ wide
ROAD REPAIR HISTORY
• 1927, 1933, 1965 – Road reconstructions
• 1973 - Fairmont Drive opened as a bypass
• 1998 - upslope repair performed
November 6, 2024 Facilities and Transportation Committee Meeting 5
ROADWAY STABILIZATION PROJECT
1 2
3 1
3 November 6, 2024 Facilities and Transportation Committee Meeting 6 Pavement failure limits
2023 Storm Damage
1 2
3 4
1 4
Pre-storm erosion
Additional erosion
#
#
November 6, 2024 Facilities and Transportation Committee Meeting 7
LAKE CHABOT ROAD REPAIR COSTS
ITEM AMOUNT
Slide 1 and Slide 4 Repair Costs (estimate) $3M
Stabilize Erosion Sites 2 and 3 (estimate) $6M
Reconstruct Pavement (estimate) $2M
Total $11M
LAKE CHABOT ROAD
Repair Funded by Grant
Repair Funded by Grant
Pre-storm erosion
Additional erosion
1 2 3
#
#
November 6, 2024 Facilities and Transportation Committee Meeting 8
CITYWIDE ROAD FUNDING NEEDS
0.5 mi LAKE CHABOT ROAD REPAIR COSTS AMOUNT
Slide 1 and Slide 4 Repair Costs (estimate) $3M
Stabilize Erosion Sites 2 and 3 (estimate) $6M
Reconstruct Pavement (estimate) $2M
Total $11M
CITYWIDE ROAD REPAIR NEEDS AMOUNT
43 miles of Failed roads (red, PCI<25) $96M
26 miles of Poor roads (orange, PCI<50) $51M
29 miles of Fair roads, (yellow, PC<65) $18M
Total (98 miles) $165M
November 6, 2024 Facilities and Transportation Committee Meeting 9 Lake Chabot Road PCI = 37 (poor, orange)
9/9/24 Council Request
• Alternating One-way Signal Feasibility
• Traffic Calming
• Grant Funding
• Emergency Access/Response
2 November 6, 2024 Facilities and Transportation Committee Meeting 10
ALTERNATING ONE-WAY SIGNAL INSTALLATION
November 6, 2024 Facilities and Transportation Committee Meeting 11 Alternating One-way Signal Control Costs
ITEM ESTIMATED AMOUNT
Design Consultant $50,000
Temporary Signal (Diesel Generator) and Traffic Control (k-rail, signs, cones) $275,000 Maintenance (~30 months) $60,000
Total $385,000
November 6, 2024 Facilities and Transportation Committee Meeting 12
TRAFFIC ANALYSIS
Evaluated period with the highest volumes - weekday morning and evening peak hour.
Focus on two scenarios representing range of the most likely conditions.
1. Historical traffic demands based on 2016 counts
2. Current traffic demands based on 2024 counts
Actual traffic conditions should be somewhere between historical and current trends. • Includes potential for increase demand from 2024 once news of the reopening is known.
Applied two different methodologies to be thorough:
1. Comparison of traffic demand vs road capacity (simple method)
2. Traffic Simulation (rigorous method)
November 6, 2024 Facilities and Transportation Committee Meeting 13
TRAFFIC VOLUMES AND SPEED DATA
November 6, 2024 Facilities and Transportation Committee Meeting 14
VIEW DRIVE
Count Date August 20, 2024
24-hour Volume 1723 vehicles
7 am-9 am Volume 110 vehicles
85th% Speed 20 mph
VIEW DRIVE
Count Date August 29, 2024
24-hour Volume 1773 vehicles
7 am-9 am Volume 114 vehicles
85th% Speed 25 mph
LAKE CHABOT ROAD
Count Date August 28, 2024
24-hour Volume 1475 vehicles
7 am-9 am Volume 93 vehicles
85th% Speed 23 mph
LAKE CHABOT ROAD
Count Date November 9, 2016
24-hour Volume 3,500 vehicles
7 am-9 am Volume 852 vehicles
85th% Speed 23 mph
• Alternating green light for each entry point.
• System with 2 entry points has shorter wait
time than system with 3+ entry points.
• No concurrent entries.
• Green lights cannot start until last car exits
and zone empty.
• Must be pre-timed (not actuated)
• Head-on collision prevention:
o Must be a closed system.
o No vehicle entry points (driveways or
intersections) between signals.
OK
RULES FOR ONE-WAY SIGNAL OPERATIONS
November 6, 2024 Facilities and Transportation Committee Meeting 15 May experience up to 3 minutes of red time between green lights, longer if there is a queue.
Driver typically experiences more time at red light than green light.
About 245 cars per hour served per direction.
Long wait times may encourage:
Red light violations and increase potential for head-on collisions.
Continued use of View Drive as cut-through route.
Prohibit bicycles and pedestrians.
ALTERNATING ONE-WAY SIGNAL TIMING
November 6, 2024 Facilities and Transportation Committee Meeting 16
HOURLY DEMAND
CAPACITY
UP TO 180+/- VEH IN QUEUE FOR
MULTIPLE HOURS (~4,600 FT LONG)
Demand vs Capacity Method
(2016 Volumes)
November 6, 2024 Facilities and Transportation Committee Meeting 18
QUEUE LENGTH
Demand vs Capacity Method (2016 Volumes)
UP TO 180+/- VEH IN QUEUE FOR
MULTIPLE HOURS (~4,600 FT LONG)
November 6, 2024 Facilities and Transportation Committee Meeting 19 November 6, 2024 Facilities and Transportation Committee Meeting 20 Direction
(Peak Hour)
95th percentile Queue
Length (ft)
Westbound
(7:00 a.m.)
2,364
Eastbound
(4:00 p.m.)
290
Blocks access to multiple streets and driveways for
several hours each day.
QUEUE LENGTH
Traffic Simulation Method (2016 volumes)
November 6, 2024 Facilities and Transportation Committee Meeting 21
QUEUE LENGTH
Traffic Simulation Method (2024 volumes)
Direction
(Peak Hour)
95th percentile Queue
Length (ft)
Westbound
(8:00 a.m.)
253
Eastbound
(5:00 p.m.)
172
Blocks access to multiple streets and driveways for
several hours each day.
November 6, 2024 Facilities and Transportation Committee Meeting 22
SUMMARY
Alternating One-way Signal Control
Staff does NOT recommend the implementation of alternating one-way signal control due to:
• Cost of implementation and maintenance
• Vehicle queues would block streets and driveways
• Possible increased cut-through on View Drive and other streets • Emergency vehicle conflict with through traffic and queues November 6, 2024 Facilities and Transportation Committee Meeting 23
TRAFFIC CALMING MEASURES
Speed Bumps – 85th% speed < 31 mph, steep grades (< 8%) Rumble strips – Not installed on residential streets due to noise Roadway striping improvements
• Centerline striping
• Right edge line striping
• Centerline plus edge line
+ Less costly to construct
+ Flexibility to meet future changes
+ No adverse impact on drainage
+ Can successfully reduce speeds
+ Less impacts to emergency response
+ No noise pollution from acceleration/deceleration
Before
After
GRANT APPLICATIONS
2016 - Pre-Disaster Mitigation Grant Application - Denied • Low traffic volume
• Short detour route
• Short detour travel time
2024 – FHWA Emergency Relief Grant $2,094,125
• Required City Match funds $271,318
• Erosion repair for slides 1 and 4 only
• Subject to National Environmental Policy Act (NEPA)
Complete Local Hazard Mitigation Plan Update
• Supporting document for grant application competitiveness November 6, 2024 Facilities and Transportation Committee Meeting 24 November 6, 2024 Facilities and Transportation Committee Meeting 25 1 2
3 November 6, 2024 Facilities and Transportation Committee Meeting 26
EMERGENCY VEHICLE ACCESS
1 3
2 4
5 6
8 9
7 November 6, 2024 Facilities and Transportation Committee Meeting 27 Staff
Recommendation
3 November 6, 2024 Facilities and Transportation Committee Meeting 28
NEXT STEPS
Construction
Summer 2026
Environmental Studies (earliest)
and Design
Hillside
Protection
November 6, 2024 Facilities and Transportation Committee Meeting 29
STAFF RECOMMENDATION
DEPARTMENT JUSTIFICATION
City Manager’s Office 1. Risks associated with unrepaired storm damage at 2 slide locations
2. Risks associated natural geological hazard and erosion/slide history Public Works Department 3. Minimizes vehicle cut-through traffic and waiting queues
4. Preserves pavement structural integrity
5. Streamlines environmental studies, design, and road/hillside inspections
6. Will allow uninterrupted road construction/repair
7. Current temporary traffic control is the lowest cost to implement and maintain Fire and Police Department 8. Allows emergency vehicle access
9. Minimizes conflict with vehicles in the event of an emergency response
10. Allows public use in emergency circumstances
November 6, 2024 Facilities and Transportation Committee Meeting 30
1. KEEP LAKE CHABOT ROAD CLOSED, AS CONFIGURED.
2. FOCUS ON COMPLETING ROAD REPAIRS, AS REQUIRED BY FHWA GRANT.
3. EVALUATE AND IMPLEMENT APPLICABLE TRAFFIC CALMING MEASURES.