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We focus on compliance and innovation

We provide expert ecological consulting services related to the full life cycle a project: from identifying potential natural resource constraints, field studies and data collection, agency scoping and coordination, compliance strategy and reporting, mitigation design, construction oversight, to post-construction monitoring and reporting.

CORVUS is a 6-person firm providing professional natural resource consultation services for a wide variety of sectors and client types.

Our focus
Clean Water Act (CWA) Section 404 compliance, Endangered Species Act (ESA) compliance, Migratory Bird Treaty Act (MBTA) compliance, restoration planning
we’ve established excellent working relationships with federal regulators and are known for our collaborative and down-to-earth project approach.
Regional Recognition
for our creative and effective environmental compliance strategies.
ESB Certified by CDOT, SBE and EBE Certified by CCoD

Our services include:

Clean Water Act section 404 compliance
Threatened and endangered species surveys
Endangered Species Act compliance
Wetland and riparian mitigation and restoration
National Environmental Policy Act compliance
Migratory Bird Treaty Act compliance

CORVUS provides expertise in ecological consulting and research, and specializes in compliance with federal and state environmental regulations.

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Our Team


Tim DeMasters

Principal / Project Manager

Tim has 17 years of natural resource consulting experience working on a large variety of projects ranging from large hard-rock mines in AK, coal mines in WY, pipelines in IL and TX, to many energy, transportation, water resources, and development projects throughout in Colorado.


KristiLee Halpin

Project Manager / Ecologist, MS, PWS

Specializes in wetland mapping and delineations, wetland functional condition assessments using the FACWet method, habitat mapping and assessments, T&E surveys, preparation of technical reports (delineations, biological resource reports, nationwide permit applications, individual permit applications, mitigation reports), mitigation/revegetation design, construction oversight of habitat restoration/creation, and monitoring of mitigation sites.


Kelly Anolin

Bookkeeper / Accounting Administrator

Highly experienced bookkeeper, with years of experience in the professional service sector. Has managed accounts for a large variety of small businesses.


Madeline (Maddie) Shields

Biologist / GIS Lead

Highly technical biologist, with over 10 years experience on solar and energy transmission projects. A botanist by trade and training, now focuses on wetland delineations and permitting, eagle and other migratory bird surveys. Strong GIS skills, Maddie runs our most complex mobile data form projects.


James (Jimmy) Turowsky

 Biologist / GIS Specialist

James joined CORVUS Environmental Consulting in November 2021. He is a biological technician with experience in Geographic Information Systems. James previously worked for the Colorado Natural Heritage Program where he surveyed wetlands and alpine ecosystems throughout the state.


Korby Mintken

Transportation and Wildlife Biology Lead / Project Manager

Provides biological consulting and environmental permitting expertise to projects in Colorado. He has over 9 years of experience in National Environmental Policy Act (NEPA) compliance, including extensive experience with Noxious Weed surveys and management plan development, Migratory Bird Treaty Act (MBTA), Bald and Golden Eagle Protection Act (BGEPA), Endangered Species Act (ESA), and Clean Water Act (CWA) compliance, as well as other wildlife-related laws, as related to construction projects in Colorado.

Let’s connect!

Please feel free to contact CORVUS any time! We love to talk about environmental compliance (really!) and would be happy to talk to you about your project and its compliance needs.

CORVUS is a remote-first team, based at 

Centennial, CO 80121






info [at] corvusenv.com

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