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Lake County Miller Road Improvements

Winner of the 2014 APWA Project of the Year Award

Engineering, Hydraulic Study, Design, Permitting, Community Relations

Construction cost: 
$2.4 million


The Lake County Division of Transportation (LCDOT) selected ATI to provide engineering services to improve the drainage and function of Miller Road. The well-traveled roadway experienced regular flooding and would typically have standing water overtop the road several times a year.


The selected solution required raising the road profile five feet and constructing a new three-span bridge to alleviate roadway flooding. Along the 1,300 feet of roadway, the area received up to five and a half feet of fill, with the underlying compressive soils (peat) exceeding 23 feet in depth. To minimize differential settlement, the fill was constructed in multiple layers with triaxial geogrid reinforcement between each level.


During design and construction, the project footprint was specifically limited to minimize impacts to wetlands, trees, and neighboring properties. The design utilized the existing horizontal alignment, incorporated 2:1 foreslopes and guardrail, minimal grading outside of the ditches to reduce wetlands impacts, no additional permanent right-of-way acquisition, and minimal temporary construction easements. Retaining walls and tree wells were incorporated into the design to minimize tree impacts. Additionally, prior to beginning earthwork and operations, the construction schedule required ditchlines to be constructed and stabilized, including wetland type perennial plant plugs and protective fencing.


LCDOT, ATI, local municipalities, and the public coordinated to develop a content sensitive solution that minimized impacts by using limited footprint to produce an aesthetically pleasing and highly functioning corridor that was well-received by the community.



Flood mitigation

Incorporate up to 5 1/2 feet of fill over a length of 1,300 feet above 23 feet of peat

New three-span bridge

Aesthetic consideration form liners and wood guardrails

Environmental Considerations



Hydraulic Study

Complete Design

Community Relations

LCSMC Permit

IDNR Permit


Compensatory Storage