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Ameren Illinois Rivers transmission line river crossings
Interstate 74 – redesign services
South Florida Water Management District – headquarters building
Illinois Air National Guard facility design
Indianapolis International Airport services
Monroe County Airport
CapX2020 Mississippi River T-Line Crossing
Ameren Illinois Rivers Project
Indianapolis International Airport - Taxiway B rehabilitation
Midwest power-generation station projects
BNSF's Memphis Intermodal Facility expansion
DuPage National Technology Park Cyber Continuity Center
Macon County Beltway
Town Branch sewer rehabilitation
Missouri River Freight Assessment
P&L Railway Bridge design and construction
Muscatatuck Urban Training Center
Interstate 64 Missouri River Bridge - new bridge design
Springfield Airport Authority contract advisory services
Li Ka Shing Knowledge Institute
Lake County Judicial Center – commissioning services
Duke University – Levine Science Research Center
Charlotte County Airport design-build project
Caterpillar Inc. industrial projects
DHA BUILDER Asset Management System
BNSF Railway – Canadian River bridge design
Indiana Hoosier SAFE-T – Emergency Communications System
Fairfield and Gilmer Interchange Improvement
Illinois Tollway’s Cherry Valley interchange
Metropolitan St. Louis Sewer District – watershed mapping
USACE hydrographic surveys
Muscatine Joint Readiness Center
Tri-State Tollway reconstruction
University of Illinois at Springfield
SSM Health Good Samaritan Hospital
East Carolina University M&V audit
USF Juniper-Poplar Residence Hall
Abraham Lincoln Capital Airport - architectural design services
Sarasota Bradenton International Airport
Eastern Illinois University Renewable Energy Center
CWLP’s Dallman 4 – power-generating unit
BNSF bridge replacement over Des Moines River
City of New York – Emergency Radio Communications System
Kentucky Riverport Improvement
City of Rockford – Multilane Roundabout
U.S. Army Corps of Engineers - Roads Acting as Dams
Combined Service and Maintenance Support (CSMS) Bridging Documents
Clark Bridge - design services
FEMA Technical Assistance Contract
The Horace Mann Cos. retro-commissioning
South Suburban Airport – land acquisition services
Waukegan National Airport
Bowman Field
Liquefied natural gas tank projects
Sangamon County guaranteed energy savings contract
Chicago Region Environmental and Transportation Efficiency Program
International Broadcasting Bureau – Kuwait transmitting station
Capitol Avenue Corridor Improvements
Fort Hood Pavement Condition Surveys and Management Plan Updates
Monarch-Chesterfield Levee flood-wall design
F-16 Engine Centralized Intermediate Repair Facility (CIRF)
Indiana State Route 641 Bypass design
Broward College – student affairs complex renovations
Zora Neale Hurston Building retro-commissioning
Pompano Beach Air Park
Sustainability paves way for Runway 2-20
Blue Grass Airport
Springfield Clinic Sixth Street expansion
Union Pacific Railroad - Global III Facility planning & design
U.S. Coast Guard - LORAN-C high-power transmitter stations
Outdoor Advertising Control Support Services
CWLP Spaulding Dam Spillway Gate Rehabilitation
Military Special Forces Centric Training Center design
Shiloh Readiness Center
Interstate 255 rehabilitation
Torrey Pines Molecular Research Center – commissioning services
Rohde Building retro-commissioning
DeKalb Taylor Municipal Airport – instrument landing system
Fermi National Accelerator Laboratory projects
BNSF Railway – Renton, Wash., railroad bridges replacement
International broadcasting stations
AT&T Reno, Nev., central office expansion
Raney Street relocation and extension
Lockport Lock and Canal Wall
Palm Beach Atlantic University
USF – central energy plant commissioning
Orange County Public Schools commissioning and retro-commissioning
Charlotte County Airport – general consultant services
Suffolk Construction Co.’s South Florida headquarters
Anacacho Wind Farm
Papalote Creek Wind Farm, Phases I and II
Alaska Railroad Corp.’s Northern Rail Extension
Interstate 57 interchange
Lock 22 extension feasibility study
Selfridge Munitions Facility
State of Florida Special Needs Shelters
Leesburg International Airport
Valkaria Airport improvements
USACE Alaska Railhead Facility
Centennial Bridge traffic study and rehabilitation
Memorial Physician Services medical office
Southern Illinois University at Edwardsville
Turlington Building
North Carolina Central University – building commissioning
University of Florida East Campus Data Center
University of North Florida Biological Sciences Building
Arcadia Municipal Airport
Naples Municipal Airport
Simmons Cancer Institute
Florida Hospital Energy Roadmap Phase 1
Springfield Clinic 1st Expansion
Emiquon Preserve Water Control Structure
National Precast Concrete Association – plant quality assurance audits
Memorial Center for Learning and Innovation
Tennessee Waterways Assessment Study
Southeast Iowa Regional Economic and Port Authority
Hillside Town Center development
Sandy Grove Middle School

Ameren Illinois Rivers Project

Hanson is providing engineering and scientific services to Ameren Transmission Co. of Illinois on many aspects of the Illinois Rivers Project. The project includes more than 385 miles of new transmission lines from Palmyra, Missouri, to the Indiana border east of Marshall, Illinois. Highlights of our services include:

Geotechnical characterization and flood hazard mapping

The project’s magnitude requires a quickly accessible methodology for determining the physical properties of the soil conditions along the route alignment. To assist with that effort, Hanson used various geographic information system (GIS) databases, collected from multiple public sources, to produce maps that may be used to develop access plans (soil drainage maps) and property easement negotiations (topsoil thickness maps) and identify potential construction issues caused by surface or subsurface geologic conditions (geohazard maps). Hanson also generated geological and flood inundation cross-sections.

Additionally, Hanson’s water resource engineers developed flood hazard boundaries for streams and rivers that will be crossed by the proposed transmission line routes. The analysis resulted in the determination of the 100- and 500-year flood elevations and 82 significant stream crossings along the entire route. Hanson created corresponding inundation maps (floodplain maps) for these crossings to aid Ameren in identifying possible permitting issues and assisting the project team with layout and design of the proposed pole structures.

Critical access route evaluation

For critical access route evaluation, Hanson screened 7,728 public roadways in 19 Illinois counties to identify those that may be problematic to construction vehicle traffic using access routes along the proposed transmission line. Hanson provided the locations in Google Earth’s KMZ format; a table listing the roadway locations and load capacities or clearance limitations; and a potential detour length for affected construction traffic. Hanson also prepared performance specifications that outlined requirements for roadway planning and use.

Transmission line segments and substation subsurface investigations

Hanson is providing subsurface investigations and foundation designs for more than 2,200 transmission line monopoles for the project line segments. Soil borings began in July 2014 under the sometimes challenging constraints of property access. As of January 2017, the Hanson team has performed subsurface investigations for more than 1,900 foundations. Hanson also performed value engineering on the project, and as an example, realized a savings of 10,000 pounds of reinforcing steel on a single foundation.

Hanson also has provided subsurface investigations and foundation engineering recommendations for the nine substations between each segment and four of the substation area connections.

Transmission line segments foundation design

Hanson has provided foundation designs for more than 1,850 monopole structures. Foundation designs have included straight-sided drilled piers, vibratory-driven caissons and soil tie back-augmented drilled piers.

Because of the number of structures, the tight schedules and the multiple and constantly evolving inputs, Hanson’s design process uses database and spreadsheet interaction for maximum efficiency and to reduce the chance of human error. This database allows the necessary design data to be organized, sorted and combined into a standardized format for each foundation.

Pier foundation design comparison and criteria study

Hanson also is in the process of providing a pier foundation design and criteria comparison to Ameren. The general design approach, load factors, deflection criteria and reinforced concrete design procedure used on the Illinois Rivers project are being compared with those typically used by Hanson on other projects. The Hanson team will suggest changes to the Ameren basis of design for drilled pier foundations, with the intent of balancing economy and reliability.

Drilled pier construction quality assurance

Construction quality assurance for monopole foundation construction has been provided for the substations constructed to date and about 1,400 foundations of the transmission line. Construction quality assurance has included on-site observation of pier construction, including observation and evaluation of subsurface conditions during excavation, pier excavations for conformance with the plans and specifications, reporting of field observations and tracking of third-party concrete strength testing.


Hanson has performed natural resources field studies and associated permitting and agency coordination support for the nine main substations, the area connections between line segments and substations and the Pana to Faraday and Pana to Austin segments in Christian, Montgomery and Sangamon counties. These lines total about 55 miles of overhead electric transmission line. The project requires careful coordination because of the accelerated schedule and ongoing revisions to the transmission line alignment and access roads. Services include current and historic mapping review, wetland delineations, Indiana bat habitat assessments, coordination with the U.S. Army Corps of Engineers regarding the preliminary jurisdiction determination, U.S. Fish and Wildlife Service habitat assessment reporting, preparation of permit applications for temporary and permanent wetland/waterbody impacts and federal and state agency coordination.

Water resource engineering and related regulatory support services also were completed to assess the alignment of the proposed transmission pole foundations to determine the applicability of Illinois Department of Natural Resources, Office of Water Resources, Statewide Permits for the proposed structures in the FEMA designated floodway or jurisdictional floodway and provide local floodway manager liaison for structures located in a floodway less than 10 square miles.

Project Quick Facts


Ameren Corp.


Throughout Illinois, IL

Date Completed:


Areas of Emphasis:

Power Delivery

Services Provided:

Permitting Geotechnical Engineering GIS & Data Management Project Management Regulatory Compliance & Assessments Structural Engineering Surveying Water Resources Engineering



"Hanson is a valued partner with Ameren and provides a very high quality product."

" ~Kevin Gerhardt, Project Manager, Ameren Services