hydrologic/hydraulic modeling

Crossman Engineering is a Rhode Island-based firm with over thirty years of corporate experience whose team of professional engineers, land surveyors and landscape architects provides planning, design, project management and innovation for public and private sector clients throughout New England.

civil engineeringconstruction monitoringenvironmental engineeringexpert witness and forensic servicesLandscape Architectureland surveyingpermittingsite planningStormwater engineeringtraffic engineeringtransportation engineeringwater and wastewater system design

Heneghan Associates (HA) is a multi-disciplined civil engineering and land surveying firm founded in 1986, providing professional services to public and private sector clients. It has more than 35 employees with offices in Columbia, Jerseyville, Maryville, and Mt. Vernon, Illinois and Arnold, Missouri. Services include transportation engineering, land planning/development, environmental engineering (water, wastewater, storm water), surveying, and funding assistance.

civil engineeringconservation engineeringconstruction administrationconstruction observationconstruction stakingdesign-bid-builddesign-builddesign-build-financedetention/retention basin designdrainage studiesenvironmental permittingfloodplain studiesgrant and funding assistanceland surveyingNPDES permittingstorm sewer and culvert designtreasury servicesutility billing

JM Davidson Engineering, D.P.C. (JMD) is a certified WBE/DBE civil engineering firm founded in 2015 by Jaime Davidson, PE. JMD offers a full range of civil engineering services including water and wastewater, structural, transportation, water resources, and railroad design services, assisting projects from preliminary design through construction.

bridge design and inspectioncivil engineering designconstruction administrationconstruction inspectionenvironmental permittingfloodplain modelingload ratingsrailroad designstormwater managementstream restorationstructural engineeringtransportation engineeringwater and wastewater treatment designWater resources engineeringwetland delineation