Hydrographic Surveying2019-09-30T18:26:28+00:00

Measuring & Mapping Data for Water-Dependent Projects

TWM offers a highly skilled team of professionals who measure and map navigable water bodies and accompanying shorelines to accurately and safely provide high resolution 3D images. These functions include measuring depths for dredging, locating and mapping debris fields or submerged obstructions, and preparing for underwater construction. Using high frequency single- and multi-beam sonar systems, magnetometer and gradiometer technology, and other vessel resources, TWM performs hydrographic surveys that capture full coverage of a project area and all necessary data. Our team operations are supervised by a Certified Hydrographer.

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  • Flood Control & Capacity Studies

  • Mobile Vessel Laser Scanning

  • Geodetic Control Surveys

  • Bathymetric Surveys & Cross-Sections

  • Geophysical Surveying & Geotechnical Investigation

  • Environmental Monitoring

  • Port Management

  • Dredge Studies & Permitting


TWM continues the important business of supporting our nation’s essential infrastructure in these uncertain times. We are committed to our mission of providing Exceptional Service, Nothing Less to you, our clients and partners. As a professional services firm, the health of our employee-owners and their families is paramount. We are following government directives and public health guidance, implementing work-from-home and other social distancing and hand hygiene practices. We have employed additional technological resources to support our modified operating structure, and we expect to be able to do so with minimal disruption. If you need to visit our offices in person or have trouble reaching your TWM contact, please contact us at 618.624.4488 so we can make arrangements or put you in touch with the appropriate person. Thank you for placing your trust in TWM. Wishing you safety and good health.