Pass Creek Ranch & Butler Dam
Overview
Dam Rehabilitation & Sitewide Structural Support
Advanced Geotechnical Solutions (AGS) provided geotechnical engineering and subsurface exploration services for two related efforts near Parkman, WY:
- Butler Dam Rehabilitation
- Evaluating the structural condition of an existing 32-foot-high, 400-foot-long dam
- Identified significant leakage and a failing outlet works system
- Supporting dam reconstruction with targeted engineering and design input
- Pass Creek Ranch Structural Development
- Conducted subsurface investigations for the placement of 7 new or relocated structures, including:
- Residential cabins
- Bridges
- A workshop and boathouse
- Relocated tack barn and dance hall
- Delivered soil condition assessments and foundation recommendations to ensure lasting structural stability
- Conducted subsurface investigations for the placement of 7 new or relocated structures, including:
Key Challenges
- High seepage rates through the base of Butler Dam
- Cloudy, bentonite-laced water rapidly emerging after borehole backfilling
- Evidence of a major internal flow path likely caused by:
- Damaged outlet works
- Mixed-material embankment construction
Solutions
To mitigate seepage and support reconstruction, AGS proposed:
- Two dam reconstruction options:
- Reinforced clay core embankment using salvaged materials
- Full clay embankment using imported low-permeability borrow soil
- Seepage mitigation measures:
- Extending the clay core deeper into foundation soils
- Considering a soil-slurry cutoff wall, modeled to reduce seepage by 15–25%
Results (In Progress)
Ongoing work will improve long-term dam performance, ensure structural stability for multiple new and relocated ranch structures, and support the safe development of a complex rural site.
Let’s Talk
Working on a dam rehab or rural site development?
Advanced Geotechnical Solutions brings experience and innovation to every challenge.
Contact us today to get started.
