Our Team

Our team provides expertise in water management and ensures all aspects of the District run smoothly. They are passionate about water and ensuring the health of our watersheds.


Executive Director

Sean Cronin is the Executive Director for the St. Vrain and Left Hand Water Conservancy District and carries out all other duties and responsibilities as assigned by the Board of Directors (Board). He represents the Board in ongoing relationships with partners and constituents and recommends to the Board an annual budget and workplan that will meet the needs of both. Cronin serves as leader to a top tier, high octane group of professionals that cherish the gift of ensuring a secure water future for the region.

Cronin lives in his adopted home of Colorado with his wife and two children. When he isn’t spending time with family and other activities, you can find him on a river trying to master the art of making a trout rise.

Credentials: Cronin has 30 years experience in water resource planning and policy. He earned his bachelor’s degree in Environmental Science from the University of North Carolina at Charlotte, and spent two years as a Natural Resources Agent with the North Carolina Cooperative Extension Service before moving to Colorado. Prior to joining the District, he spent 13 years with the City of Greeley, including the last six as their Water Resources Manager.

Cronin serves on the Interbasin Compact Committee (IBCC) and was the chair of the South Platte Basin Roundtable. He is a recipient of the Colorado Foundation for Water Education – Emerging Leader Award, Colorado Water Congress POND Leader of the Year Award, and under Cronin’s direction, his District received a Collaboration Award from the Special District Association.


Office Manager

Mona Ruark is the Office Manager for the St. Vrain and Left Hand Water Conservancy District. Ruark supports the entire team, Board of Directors, and in most cases is the first point of contact for our constituents. She cares deeply about the human connection to water and is honored to be part of an organization that serves people. As a new resident of Colorado, she enjoys hiking and exploring the Front Range.

Credentials: Ruark has over 20 years of nonprofit experience in the areas administration, project coordination and grant writing. Prior to joining the District, she worked for a food bank in Santa Fe, New Mexico.

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Water Resources Engineer

As the District’s Water Resources Engineer, Griebling provides technical expertise and project management oversight for several of the District’s projects. He runs the District’s Augmentation Program and operates its associated water infrastructure. When he isn’t scheming to install a climbing wall in the District office, Griebling makes sure the office plant life stays alive and is happy to share a dad joke with anyone who makes the mistake of requesting one.

Griebling grew up backpacking, fishing, canoeing, and rafting throughout Colorado. He continues to get out in the backcountry and shares his love of the outdoors and Colorado water with his family.

Credentials: Griebling has 18 years of experience in integrated hydrologic modeling, groundwater modeling, data analysis, GIS, hydrologic systems monitoring, and water resources planning. He earned a bachelor’s degree in Civil Engineering at the University of Colorado, Boulder, then returned to Boulder to earn a Master’s Degree in Civil Engineering after spending several years working on river restoration projects in the Pacific Northwest. Before joining the District, Griebling spent 8 years working on the Platte River Recovery Implementation Program as part of the Executive Director’s Office staff.

SVLH Jenny

Watershed Program Manager

Jenny McCarty is the District’s Watershed Program Manager, providing ecological expertise, project management oversight and partner support across several of the District’s projects and programs. McCarty also represents the District’s interests in many regional collaborative groups and in communications with the Board of Directors. Outside of her normal duties, McCarty keeps Sean on schedule in meetings, makes colleagues think about mushrooms at least once a week (whether they want to or not), and ensures the kitchen chocolate supply is always dwindling.

McCarty grew up near Evergreen, Colorado and spent time camping, fishing, horseback riding, and hiking throughout the state. She continues to enjoy outdoor fun at home and abroad with her partner, seeking mountain biking, rock climbing, skiing, and river paddling adventures. Her love for nature is further explored in hobbies like wild food foraging, painting, and pottery.

Credentials:: McCarty has over 12 years of experience in watershed planning, water quality monitoring, aquatic organism ecology, stakeholder engagement, data analysis and project management. She earned a bachelor’s degree in Biology at the University of Denver and a Master’s in Stream Ecology from Montana State University, Bozeman. In between degrees, she spent several years working on a variety of aquatic resources projects in Colorado, North Carolina, and Alaska.

Before joining the District, McCarty spent almost 4 years consulting on a variety of Colorado Front Range projects, specifically wholistic watershed analysis, wildfire recovery, and urban impacts planning in sub-watersheds of the South Platte and Poudre Rivers.


1715 Iron Horse Drive, Suite 250
Longmont, CO 80501

Email: [email protected]
Phone: 303-772-4060

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