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Home My WebLink About005.01 - Appendix D.1 - Access Deviation November 4, 2025 Taylor Lonsdale City of Bozeman 20 East Olive St Bozeman, MT 59715 Reference: Bozeman Yards North – updated with City comments addressed Project No. 06020.11 Taylor: The purpose of this letter is to provide a summary of traffic engineering services completed in support of the Bozeman Yards North project in Bozeman, MT. A deviation is requested per the City’s Uniform Development Code (UDC) (38.400.090.H) to permit two approaches closer than the UCD allows with a deviation from the access spacing requirements. The two proposed approaches requiring an access deviation are full movement driveways to single-family residential units within the Bozeman Yards North development and are located along the western side of Front Street. Other access locations to the development would not directly service these units, including an alley on the west leg of the Front Street/Ida Avenue intersection. Adjacent to the Bozeman Yards North site, Front Street and Ida Avenue are classified as local streets with speed limits of 25 mph. The UDC (Table 38.400.090-1) outlines the required distance for access spacing on local streets to be 40 feet. The measured distance between the proposed driveways is 25 feet. Each approach is proposed to provide direct access to a single residential unit with a single-car garage. A deviation is requested per the UDC, Section 38.400.090.H for the proposed approaches. When addressing UDC 38.400.090.H.3.a through 38.400.090.H.3.c, each approach will have an average weekday volume of seven vehicles and each is expected to operate at LOS A during both the AM and PM peak hours. The 95th percentile maximum queuing is expected to be negligible at both approaches and on Front Street and is therefore not expected to impact onsite or offsite vehicle flow. The existing daily volume on Front Street is approximately 1,000 vehicles per day, and may increase to 1,500 vehicles per day in a 15-year future horizon. Intersection Sight Distance (ISD) was evaluated at the proposed approach locations using criteria from the AASHTO’s A Policy on Geometric Design of Highways and Streets, Chapter 9.5.3.2. A passenger car was evaluated as the design vehicle based on residential nodes and, although the posted speed limit is 25 mph, a design speed of 15-mph was selected due to the curvature of roadways adjacent to the driveway locations and expected slower driving speeds in this area. For a left-turn egress Mr. Taylor Lonsdale November 4, 2025 Page 2 movement out of the site, a passenger car would require 170 feet to the east. For a right-turn egress movement out of the site, a passenger car would require 145 feet to the west. Egress approach movements appear to have a minor impact on their respective sight triangles as Front Street curves into Tamarack Street and Ida Ave. The ISD triangles for each driveway are shown in the attached exhibits. The triangles were calculated assuming a driver’s eye position of 14 feet back from the edge of the traveled way. If a vehicle is pulling forward out of the driveway, this distance would be reduced and sight distance would be improved; for drivers backing out of the driveway, this is likely an accurate position of the driver. Based on the results of the AASHTO ISD analysis, on-street parking is not recommended along Front Street to improve sight distance for backing vehicles. It should be noted that upon exiting the driveway with clear sight distance, the backing vehicle maintains the right-of-way in the road, and oncoming vehicles approaching while the backing vehicle shifts to drive forward would be expected to yield. Street vision triangles were also evaluated according to UCD 38.400.100C. There do not appear to be any vision restrictions within the City’s outlined street vision triangles. Vehicle movements that ingress and egress from both the proposed driveways are expected to be fully visible from either direction. Sight triangles should be evaluated during construction to ensure vision triangles remain clear. It is recommended that site access deviation requests to the residential Bozeman Yards North development units on Front Street be approved as the location of the two driveways are not anticipated to have an impact on the health, safety, or welfare of the public. If you have any questions or concerns, please feel free to contact me at 406-922-4306 or jstaszcuk@sanbell.com. Sincerely, Joey Staszcuk, PE, PTOE, RSP1 Associate Principal | Community Transportation Studio Manager KD/GHC/JHS/ars Enc. North Building Site Plan Sight Triangle Figures P:06020.11_Bozeman_Yard_North _Access_Deviation_Memo _110425 STAIR 1 LOBBY CIRCULATION MECH/TRASH MECH ELEVATOR 1 MECH STAIR 2 CIRCULATION UNIT 103 2 BED / 25 BATH + DEN UNIT 102 2 BED / 2 BATH + DEN UNIT 101 1 BED / 1 BATH UNIT 1 2 BED / 25 BATH UNIT 2 3 BED / 35 BATH + DEN UNIT 3 2 BED / 25 BATH + DEN GARAGE UNIT 4 2 BED / 25 BATH + DEN GARAGE MECH GENERATOR ROOM PATIO PATIO PATIO BIKE & GEAR ROOM PATIO 1 BIKE PARKING SPACE 1 BIKE PARKING SPACE MAILBOXES CRAWL SPACE RESTROOM OPEN TO BELOW PACKAGE GUEST SUITE FI R E P L A C E BLOCK 104SDCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEFRONT STREET ALLEY TAMARACK STREET [] [] [] [] [][][][][][][][]OHE OHE OHE OHEOHE OHE TF UGCUGCWWW W W W W W W W W W W W W W W W W WWWWWWWWWWWWWWSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SS SSSS SSSSSSSSSS SS SSSSSSSSSSSSSSSDSDSD SD SD SD SD SD SD SD SD SD SD SD SD GASSS SS SS SS SS SS SS SS SS SS SS SSW WUGEUGEUGEGASGASGASGASGASGASGASGASGASGASGASGASGASGASUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGEUGECOMMCOMM LOTS 7-16, BLOCK 104 [PLAT C-23-A49] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>COMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMUGEWWWWNORTH BUILDINGSSSSSS SS GAS UGE UGE UGE G A S GASSSSSSSSSSS 15/3/2024CONCEPT PLANCDP25/31/2024SITE PLAN SUBMITTALCDPZWL39/11/2025SITE PLAN RC1CDPZWLPROFESSIONALENGINEERS &SURVEYORS BOZEMAN YARDS NORTH622 E TAMARACK ST.STAHLY ENGINEERING & ASSOCIATES ASHY, LPBOZEMAN, MTC1.1 CIVIL SITE PLAN 006 KEY - 15 MPH PASSENGER CAR NORTH APPROACH LEFT TURN FROM STOP RIGHT TURN FROM STOP PROPOSED NORTH APPROACH IDA AVETAMARACK STREET FRON T STREE T KEY - 15 MPH PASSENGER CAR SOUTH APPROACH LEFT TURN FROM STOP RIGHT TURN FROM STOP IDA AVETAMARACK STREET FRON T STREE T PROPOSED SOUTH APPROACH