Civil, Structural, Environmental and Transportation Engineers and Land Surveyors

 
 
 
 
 
 
 
 

Recently Completed or Ongoing Projects

Stahly Engineering & Associates was built on the foundation of hard work and integrity.

"We take pride in providing technical expertise that is coupled with exemplary service."
- Jeff Larson, P.E., Principal

Projects below are organized by the 'type of service'.
Click on a picture to enlarge.

To jump to a specific area, click on a service title below:
Transportation | Water and Wastewater | Bridges and Structures
Site Civil Engineering | Land Survey | Land Development/Subdivisions

Transportation

  North Main Street Reconstruction, Helena, Montana
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   This project encompassed the complete reconstruction of North Main Street, an urban arterial in Helena, from Montana Avenue to Lyndale Avenue. The design detailed a five lane facility with raised medians to replace the existing 2-lane roadway. SE&A designed this project for the Department of Transportation in conjunction with
    the City of Helena. Design amenities included landscaped medians, boulevard sidewalks, a path through an adjacent park (YMCA), a bike lane, and a pedestrian underpass connecting Memorial and Centennial Parks.
    Services Provided:
   
  • Cadastral survey and topography pick-up survey
  • Right-of-way and utility plans
  • Traffic signal design - two multi-lane signalized intersections
  • Roadway design including signing, pavement markings, underground storm drainage, lighting/electrical, and landscaping
  • Construction oversight and assistance during construction of the project
   
Client: Montana Department of Transportation
  Lyndale Avenue Overpass, Helena, Montana
    Click to enlarge
   A modern four-lane urban roadway with intersections, lighting, landscaping, storm drainage and bicycle/pedestrian facilities was designed to replace the existing facility. Replacing the existing bridge with a large pedestrian culvert to carry pedestrian/bicycle and emergency traffic from the Carroll College Campus into the new Great Northern
    Town Center Facilities was a key component of the project.
    Services Provided:
   
  • Cadastral survey and topography pick-up survey
  • Right-of-way and utility plans
  • Roadway design including signing, pavement markings, underground storm drainage, and a 12’X12’ concrete underpass
  • Construction oversight and assistance during construction of the project
   
Client: Montana Department of Transportation
  Dickie Bridge to Wise River Reconstruction, Wisdom, Montana
   

SE&A provided project development and design for the reconstruction of 12.3 km of highway 46 from Dickie Bridge ( Big Hole River bridge) to the town of Wise River. The portion of the project in the Town of Wise River was planned for an overlay, but as the design developed, new curb and gutter was designed to replace deficient curb and gutter and driveway approaches detailed to improve access to the highway. Wetlands along the project corridor were common and all wetland impacts were identified and mitigated. Hydraulic analysis and design for creek and drainage crossing, including fish passage was a big part of the project as well.

   
    Services Provided:
   
  • Engineering survey
  • Roadway design and plan preparation
  • Pavement marking and signing design and plan preparation
  • Right of Way design and utility plan preparation
  • Wetland evaluation
  • Hydrology and hydraulic analysis and report preparation
  • Sprecial provisions and cost estimate
  • Bridge rail retrofit
  • Cadastral survey, right of way monumentation, and C.O.S. preparation
   
Client: Montana Department of Transportation
 

National Highway System Routes Guardrail Projects, Montana Department of Transportation Districts throughout the State

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Two phase projects to provide engineering services to upgrade existing blunt end guardrail terminal sections and associated guardrail design problems on non-Interstate National Highway System (NHS) Routes in the five MDT Districts. 
   

Phase 1 confirmed the identity of the terminal end sections identified in a 1995 Survey and photographing all unconnected bridge rail sections and unprotected bridge parapets for the MDT Bridge Bureau.

Phase II involved surveying the identified upgrade locations for slope data and wetland impacts. The wetland impacts were used in preparing the Categorical Exclusion environmental documents while the slope data was used to calculate guardrail “length of needs” and develop construction documents. Plans were developed for construction in coordination with the Bridge Bureau.
   
Client: Montana Department of Transportation
  Brady Street Reconstruction, Helena, Montana
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This project was a full width urban street reconstruction on a busy collector. It was administered by MDT, and funded through an SID and a MACI grant. The City of Helena was also closely involved in all phases of the project. The project included new asphalt surfacing, curb and gutter, signs and sidewalks.

   

A railroad crossing was coordinated with the railroad through the City of Helena. In addition to preparing plans, Stahly Engineering & Associates (SE&A) provided the topographic and cadastral survey, storm drainage, and a traffic study. Our firm generated hydraulic reports, alignment and grade and scope of work reports. Public involvement was a major part of the project. SE&A assisted the City with the SID process.

Traffic calming to slow travel speed and discourage truck traffic was a priority of the local residents along Brady Street. After receiving public input, a traffic calming island design was selected and incorporated into the project. This design was used in two locations along the project corridor.
    Services Provided:
   
  • Survey
  • Hydraulics
  • Plan and special provision preparation
  • Public relations
  • Traffic study
   
Client: Montana Department of Transportation
 

Term Contract for Traffic Study Reviews, Montana

   

SE&A reviewed MDT system traffic impact studies submitted by private developers requesting access to MDT maintained roadways. Our reviews have included Riverside Development south of Whitefish, Hyalite Subdivision near Bozeman, the Billings Operation Center, Town Pump in Libby, and the Bozeman Gateway.
   
Client: Montana Department of Transportation
 

Ongoing projects for the Montana Department of Transportation

   
  • Montana City Intersection Redesign - one of Montana's first  Roundabout designs will be utilized at this intersection
  • Highway 93 Reconstruction - Medicine Tree to Red Horn Road, Near St. Ignatius, Montana
  • Sportsmans Campground, Wise River, Montana
  • Marysville Road Reconstruction, Marysville, Montana
  • Term Contract for Survey Services - Butte and Great Falls Districts
  • Term Contract for Right of Way Plans
   
Client Montana Department of Transportation
  Lemhi Pass Reconstruction, Beaverhead County, Montana
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This road lies in Beaverhead County in Southwest Montana. The improvements were funded by special U.S. Forest Service monies related to the Lewis & Clark Bicentennial. The Corps of Discovery traversed Lemhi Pass some 200 years ago. The project consisted of 8 miles of road reconstruction including two significant waterway crossings.

    Services Provided:
   
  • Cadastral survey and right-of-way plans
  • Hydraulic analysis and reporting including fish passage
  • Wetland evaluation and mitigation
  • Road plans and project manual
  • Construction inspection and administration services during construction including construction staking
   
Client: Beaverhead County
 

Lewis and Clark County RID Maintenance Projects

   

Serving as the engineering consultant for Lewis and Clark County Public Works, Stahly Engineering & Associates conducts “windshield” surveys of Rural Improvements Districts within the County to determine the need for upgrades or maintenance. From these surveys, improvements are prescribed and may include crack sealing, full depth pavement replacement, skin patching, pothole repair and asphalt seal and chip resurfacing. SE&A assists in public presentation of prescribed repairs and costs associated with the repairs.

Once members of the RID accept the potential increase in cost to their RID, SE&A provides construction specifications and assistance throughout the bidding process. Following selection of the construction contractor we are responsible for construction management and inspection.
    Recent Lewis and Clark County RID's that approved projects for development include:
   
  • Gable Estates
  • Lincoln Streets
  • Dusty Maiden
  • Orofino
  • Maynard Applegate
  • McHugh Lane
Click to enlarge
Chip Sealing Lincoln Streets
   
Client: Lewis and Clark County
 

Renovation of 400 Block of Downtown, Helena, Montana

     

This project involved total reconstruction of the 400 Block Street section of Last Chance Gulch. Community Transportation Enhancement Program (CTEP) funds were used for sidewalk replacement, street trees, landscaped intersection bulbs, underground irrigation, and historical lighting fixtures.

    Tax Increment Financing (TIF) monies were utilized for a new storm drain main which is used as an outlet for roof drains which previously went into the sewer. A Special Improvement District (SID) made up the remaining funding.
    Services Provided:
   
  • Survey
  • Roadway Design
  • Public Involvement
  • Curb and Gutter Design
  • Sidewalks
  • Storm Drainage
  • Landscape Planning
  • Construction Management
  • Construction Staking
  • Construction Inspection
   
Client: City of Helena
 

North Montana Widening, Helena, Montana

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This project involved the widening of Montana Avenue to mitigate impacts created by two large commercial developments, Skelton Addition and the Northside Center. The Skelton Addition work was completed first and involved widening from two lanes to four lanes with a curb and gutter on one side.

    The Northside Center portion added a 5th lane, curb and gutter on the opposite side, and a traffic signal. Once all pavement widening was complete the existing pavement was milled and the entire project was overlayed.
   
Client: Private
  Whitehall Streets Improvement, Whitehall, Montana
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   Stahly Engineering & Associates provided the Town of Whitehall with an innovative, cost effective engineering design to improve local streets. The design included an overlay consisting of rejuvenated (adding 1.5% oil) millings from a nearby Interstate project. To facilitate storm water runoff, drainage swales were provided at several of the intersections.
   

SE&A was responsible for the preparation of bid documents and construction specifications, bid tabulations and made bid award recommendations to the Town. Construction management and inspection were also performed. The new pavement surfaces received an application of an asphalt seal coat and chips. The overlay program took three years to complete and a total of 4.7 miles of streets received the overlay.

A second phase of this street improvement project is currently ongoing.
    Services Provided:
   
  • Survey
  • Roadway Design
  • Bid Documents
  • Construction Specifications
  • Construction Administration
  • Construction Inspection
   
Client: Town of Whitehall

Water and Wastewater

  Lewis and Clark County/Lincoln Sewer District Wastewater System Upgrade, Lincoln, Montana
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   From analysis and planning to construction oversight, SE&A assisted the County and the Lincoln Sewer District in upgrading the wastewater system for the Town of Lincoln. Final design involved constructing a 13.6 million gallon lagoon with an irrigation system to land apply treated
    effluent, new intercell piping, and replacement of existing submersible pumps. In addition, 1,800’ of collection main was replaced and the lift station was upgraded.
    Services Provided:
   
  • Facility Plan
  • Assistance with Funding Applications for DNRC Grant, CDBG, SRF Loan
  • Preliminary and Final Design
  • Construction Management and inspection
   
Client: Lincoln Sewer District
  Victor/Hamilton Wastewater System Upgrade, Victor, Montana
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   Considerable grant funding was obtained to provide upgrades to the Victor/Hamilton wastewater system. Improvements consisted of an additional aerated lagoon and storage cell with spray irrigation for the flows in excess of the infiltration basin capacities. The aeration cell and the storage cell were constructed with uncovered HDPE liner.
    Services Provided:
   
  • Facility Plan
  • Public meetings
  • Application assistance for CDBG and SRF loan funds
  • Design and construction management of aerated lagoons and spray irrigation
  • EPA grant used to remove and land apply sludge from the older lagoon
   
Client: Town of Victor
  Town of Jackson Emergency Wastewater System Replacement, Jackson, Montana
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   SE&A assisted the Town in acquiring immediate grant funding when it became evident that their wastewater system was failing. SE&A wrote a Preliminary Engineering Report to assist with a grant application through DNRC. Following acceptance, our firm provided design and construction administration services to quickly restore the system.
    Services Provided:
   
  • 5' diameter concrete lift station
  • 10,000 gallon fiberglass community septic tank
  • 1,000 gallon concrete drain field pump vault
   
Client: Town of Jackson

Bridges and Structures

  Story Hill Bridge, Gallatin County,  Montana
   
  A box culvert was installed to replace this bridge in Gallatin County. The project was funded by a TSEP grant.
    Services Provided:
   
  • Survey
  • Hydraulic Analysis
  • Roadway Approach Design
  • Bridge Design
  • Bid Documents
  • Construction Specifications
  • Construction Administration
  • Construction Inspection
   
Client: Gallatin County
  Cameron Bridge, Gallatin County, Montana
    This TSEP funded bridge over the Gallatin River was designed to include a prestressed concrete M-72 girder with a cast-in-place deck founded on pile/cap stub abutments.
    Services Provided:
   
  • Project planning
  • Bridge design
  • Road approach design
  • Hydraulic analysis
  • Construction administration
  • Construction inspection
   
Client: Gallatin County
  Snake Creek Bridge, Blaine County, Montana
   
  TSEP funded bridge replacement consisting of a pre-cast, pre-stressed concrete tri-deck superstructure supported by cast-in-place concrete stub abutment.
    Services Provided:
   
  • Survey
  • Hydraulics
  • Preliminary and final design
  • Bid documents
  • Construction administration
  • Construction inspection
   
Client: Blaine County
  Theatre One Bridge, Pondera County, Montana
   
 

Bridge over Pondera Coulee was designed to include a pre-cast, pre-stressed concrete tri-deck superstructure supported by cast-in-place concrete stub abutments. TSEP funding was used for this project.
    Services Provided:
   
  • Project planning
  • Bridge design
  • Road approach design
  • Hydraulic analysis
  • Construction administration
  • Construction inspection
   
Client: Pondera County