Environmental Assessments

85th Street Improvements: Sundowner Ave. to Louis Ave., including I-29 overpass, and 85th St. Improvements from Louise Ave. to Tallgrass Ave. in Sioux Falls; Lincoln County, SD
US14/US83/SD34 Bridge over the Missouri River between Pierre/Ft. Pierre
South Rochford Road EA
The South Dakota Division of the Federal Highway Administration has recently completed an Environmental Assessment (EA) and Draft Section 4(f) Evaluation regarding proposed improvements to South Rochford Road. You are invited to attend a public meeting scheduled to discuss the EA. The meeting will be held Wednesday, April 20th from 5-7pm (MST) at the Hill City High School.
I-229 Exit 5 (26th Street) Interchange in Sioux Falls
Notice of Public Information Meeting - January 14, 2015 - and availability of Environmental Assessment (EA) & Section 4(f) De Minimis Analysis
East Side Corridor (S.D. 100 North Segment) from I-90 to South of Madison Street in Sioux Falls
Reevaluation - Environmental Assessment & Final Section 4(f) Evaluation
Reevaluation - Environmental Assessment & Section 4(f) De Minimis Impact Finding
Reevaluation - Environmental Assessment & Section 4(f) De Minimis Impact Finding
Finding of No Significant Impact (FONSI) & Section 4(f) De Minimis Impact Finding
Notice of Public Meeting - October 21, 2014 - and availability of Environmental Assessment
Peter Norbeck Scenic Byway Lake Enhancements Projects (on Bismarck, Horsethief, & Lakota Lakes)
US16 - From 1 mile West of Jewel Cave National Monument to 0.5 miles East of Jewel Cave National Monument
Downtown Sioux Falls Rail Yard Redevelopment Project
I-190 Silver Street Interchange in Rapid City
Spearfish Canyon Recreation Site Improvements - Bridal Veil Falls & Long Valley Picnic Ground
US85 project in Deadwood from US385 Jct. to Cemetery St.
South Dakota School of Mines and Technology Connector Road in Rapid City
Noise Studies on Interstate 29 from Interstate 229 to 26th Street in Sioux Falls
I-90 West, Exit 40-Exit 51
This project provides greater separation between service roads and I-90 to facilitate future 6-lane potential.
East Side Corridor (SD100 South Segment) from I-29/County Road 106 (Exit 73) to south of 26th Street in Sioux Falls
Solberg Avenue - Tallgrass Avenue Overpass of I-229 in Sioux Falls
Pierre Railroad Grade Separation
This project provides a separated railroad crossing in East Pierre to connect the highway routes through Pierre without at-grade railroad crossing delays. It includes a new highway alignment from the existing S-Curve east along Sioux Avenue to a highway overpass near Polk Street and Wells Avenue. It will allow all traffic and emergency response better access through Pierre.
Watertown South Connector Route - US 81 to 29th Street SE
Watertown South Connector Route from US Highway 212/SD 20 Intersection to US Highway 81

open all
TransportationDoing Business
Certification & AccreditationContractorsEngineering/Design ServicesEnvironmentalLocal Governments
Projects & StudiesPrograms & ServicesTravelersInside SDDOT

Contact