Preliminary Design Report

Common Bridge #1234
over
Raging River

Anytown, Maine

STP-2050(800)
WIN 10000.00

Maine Department of Transportation
Bridge Program

Table Of Contents

Background Information	1

Existing Bridge	2

Location Map	3

Bridge Recommendation Form	4

Summary of Expected Impacts	6

Summary of Preliminary Design	7

Hydrology Report	8

Hydraulic Report	9

Preliminary Plans	Appendix

Photographs	Appendix

Inspection Reports	Appendix

Existing Bridge Plans	Appendix

Hydraulics Data	Appendix

Miscellaneous Information	Appendix

Traffic and Accident Data	Appendix

Preliminary Cost Estimates	Appendix

Background Information

TOWN	Anytown	WIN	10000.00	BRIDGE NO.	1234

Bridge	Common Bridge	Road	Route 9

Funding:	Choose an item

PROGRAM SCOPE:	Choose an item

PROGRAM DESCRIPTION:	Common Bridge (#1234) over Raging River, located 0.16 of a mile easterly of Route 9. This bridge is over 20’ in length.

PROJECT BACKGROUND:	This bridge was constructed in 1930 and was widened in 1960 along with a deck replacement. It is currently in poor condition and in need of complete replacement. Preconstruction engineering was funded in the 12/13/14 WP.

JURISDICTION	State Highway	NHS	Yes

FUNCTIONAL CLASSIFICATION	Choose an item	CORRIDOR PRIORITY	3

URBAN/RURAL	Rural	FHWA SUFFICIENCY RATING	35.9

POSTED SPEED	45 mph	LOAD POSTING	15 tons

TRAFFIC:	2013	AADT	1,000	ACCIDENT DATA, CRF	1.0

2033	AADT	1,200	DHV	200

Existing Bridge

Year Built	1936	Span Lengths 60'-60'	Curb to Curb Width 24'

Type of Superstructure: Two-span continuous structure with painted steel beams, composite cast-in-place deck, bituminous wearing surface and membrane waterproofing, and concrete bridge rail.

General Condition: Steel beams are in fair condition with minor section loss along with rusting and extensive failing paint. Concrete deck is in fair condition with some spalling and leakage on the bottom. Wearing surface is in poor condition with extensive cracking and patching. Bridge rail is in very poor condition with much cracking and patching.

Type of Substructure: Mass concrete abutments on H-piles. Mass concrete pier on piles.

General Condition: The concrete for both abutments is cracked and spalled and in poor overall condition. The north wing on abutment #1 is tipped forward slightly. The pier concrete is in fair condition with some cracking and spalling.

Load Ratings:	Operating	Inventory

HL-93	40 Tons	30 Tons

Rating Factor	1.00	1.00

Legal Loads

Controlling Configuration: 1	40 Tons

Rating Factor	1.00

Controlling Member:	Interior floor beam in flexure

See Appendix F for load rating summary

STRUCTURALLY DEFICIENT	Choose an item.	FUNCTIONALLY OBSOLETE	N/A

Maintenance Problems: Cracking of bituminous wearing surface. Cracking, spalling, and vehicular damage of concrete bridge rail.

Maintenance Work: Repeated patching of wearing surface and repair of bridge rail.

Previous Structure: A timber covered bridge on granite abutments.

Other Comments: This is a non-historic bridge located in a historic district.

Location Map

Anytown, Common Bridge #1234, WIN 10000.00

Route 9 over Raging River

Latitude: 44° 05' 26.43" N, Longitude: 69° 46' 58.26" W

Bridge Recommendation Form

WIN	10000.00	TOWN	Anytown

BRIDGE NO.	1234	BRIDGE	Common Bridge

Project Manager	Name

DESIGNED BY	ABC	DATE	Click here to enter a date.

Approved by	Date

Approved by	DATE

Project: Bridge Replacement with 800’ of approaches, including transitions.

Alignment Description: Tangent on bridge with two 1000’ horizontal curves located on each end of the project to match into existing curves. A 600’ sag vertical curve with a finished grade about 1.5’ higher than the existing bridge. New centerline located approximately 4.5’ downstream of existing bridge centerline.

Approach Section: Two 11’ lanes with 4’ shoulders. 1:2 sideslopes with standard steel guardrail and 1:3 sideslopes without guardrail.

Spans	70’-70’	Skew	30° ahead on left

Loading	HL-93 modified for Strength 1	Design Speed	45 mph

Superstructure: Precast, prestressed concrete butted box beams with a non-composite leveling slab and a 3” bituminous wearing surface on ¼” membrane waterproofing. 30’ curb-to-curb with standard 2-bar steel bridge rail and a 2% normal crown. Beams made continuous for live load.

Abutments: Integral abutments with butterfly wings on H-piles driven to ledge. 1:1.75 riprapped slopes in front.

Piers: Pile bent consisting of a concrete cap on pipe piles driven to ledge.

Opening and Clearance	Existing	Proposed

Total Opening	3000 SF	3500 SF

Total Opening at Elevation 103.5 FT	2500 SF	2800 SF

fREEBOARD at Current Q10 ELEVATION	0.2 FT	2.1 FT

fREEBOARD at Future Q10 Elevation	2.1 FT

Available Soils Information: Existing plans and preliminary borings show ledge to be present at about 30’-50’ below streambed. For more information, please refer to the Geotechnical Report.

Additional Design Features: A 3’ tall garden retaining wall will be constructed between STA 200+00 and 200+25 on the north side.

Complete Streets: Click or tap here to enter text.

Maintenance of Traffic: Maintain two-way traffic on a one-lane temporary bridge located on the upstream side.

Construction Schedule: One construction season with landscaping the following spring.

Advertising Date: January 2014

Additional Borings Required? No

Additional Geotechnical Evaluations Required? No

APPROVED DESIGN EXCEPTIONS: Bridge width is less than State Standards in order to match existing corridor width.

Municipal/State Agreement Required? Specify type of agreement if required

Comments by Engineer of Design: Click here to enter text.

Summary of Expected Impacts

Right of Way	Number of:	Property Owners	4
Buildings to Be Taken	1

Type of Acquisitions:	☐	Fee Simple	☐	Easement
☐	Temporary Rights	☐	Temporary Road

Utilities: Fairpoint, CMP, Anytown Sewer, Anytown Water, State Cable

Coast Guard Permit NEEDED? No	FAA Permit NEEDED? No

Environmental Coordination

Team Member: Kristen Chamberlain

NEPA/STIP
Section 106
Section 4(f)
Endangered Species
Essential Fish Habitat
Fish Passage
In-Stream Window
Hazardous Material
Dredge Material
Stormwater/MS4
DEP/LUPC
ACOE
Mitigation
Other

Avoidance & Minimization: Click here to enter text.

Summary of Preliminary Design

Background

[Background Description]

Purpose and Need

[Purpose and Need Description]

Maintenance of Traffic

[Maintenance of Traffic Alternative Analysis]

Conclusion: Option 1 – Bridge Closure.

Utilities

[Maintenance of Utilities]

Right of Way

[Right of Way Description]

Summary of Alternatives

The following alternatives were considered:

Do nothing

Single span steel welded plate girder

Two span concrete box beams

Alternative 1:

[Alternatives Analysis]

Conclusion: Option 2 – Single span steel welded plate girder

Proposed Alternative

[Recommendation Description]

The preliminary cost estimate of this replacement is $1,800,000. For more information please see Appendix C.

Hydrology Report

Hydrology Description

Summary

Drainage Area	326	mi2
Q1.1	4,100	ft3/s
Q10	7,400	ft3/s
Q25	9,000	ft3/s
Q50	12,000	ft3/s
Q100	14,300	ft3/s
Q500	21,100	ft3/s

Reported by: Some Engineer

Date: Click here to enter a date.

Note: All elevations based on North American Vertical Datum (NAVD) of 1988.

Hydraulic Report

Hydraulic Description

Summary

Reported by: Some Engineer

Date: Click here to enter a date.

Note: All elevations based on North American Vertical Datum (NAVD) of 1988.