Compiled by James Bow

November 23, 2008

As part of the opening of the new Mount Dennis bus garage, the TTC established this circular route through the Mount Dennis neighbourhood southeast of the Jane/Trethewey intersection, so that TTC personnel could access Mount Dennis garage using the TTC’s own transit services.

Buses operate outbound from Mount Dennis garage via Industry Street, north on Todd Bayliss Boulevard, southeast on Trethewey, south on Black Creek Drive, west on Eglinton Avenue West, northwest on Weston Road, north on Jane and southeast on Trethewey to Todd Bayliss Boulevard, before following Todd Bayliss and Industry back to Mount Dennis Garage. Buses operate from 4 a.m to 9 p.m., seven days a week.

Note:

Although the TTC web site states that 171 MOUNT DENNIS buses will display “to Jane” and “to Mount Dennis” destinations on their rollsign exposures, by 2011 it was more typical for buses to display just the number and route, as seen below:

July 27, 2025

Route renamed to its full name, 171 MOUNT DENNIS with signs adjusted to reflect the change.

Sunday, October 12, 2025

In preparation for the opening of LINE 5 EGLINTON, buses on the 171 MOUNT DENNIS are adjusted to operate between Jane Street and Alliance Avenue and Industry Street to serve the new Mount Dennis Station, which remains closed to the public until the opening, replacing service previously provided by 161 ROGERS ROAD to Jane Street and Alliance Avenue.

This service is designated as 171A, which also introduces late evening and weekend service to match the span of service previously provided by the 161. Westbound operate outbound from Mount Dennis garage via Industry Street, north on Todd Bayliss Boulevard, southeast on Trethewey, south on Black Creek Drive, west on Humber Boulevard North, west on Alliance Avenue to Jane Street. Eastbound buses operate from Jane Street and Alliance Avenue via north on Jane Street, east on Lambton Avenue, south on Rockcliffe Boulevard, east on Alliance Avenue, north on Cliff Street, east on Cordella Avenue, south on Louvain Street, east on Humber Boulevard, north on Black Creek Drive, Eglinton Avenue West, northwest on Weston Road, north Ray Avenue and west on Industry back to Mount Dennis Garage.

Customers can board and exit buses at stops outside Mount Dennis Station on Eglinton Avenue West at Black Creek Drive and/or Mount Dennis Station.

Early morning trips to Mount Dennis Station is designated as 171B.

Sunday, November 16, 2025

With the opening of Mount Dennis Station to GO and UP Express passengers and TTC buses, operations on this route are adjusted to drop off and pick up passengers within the bus terminal of the station. Destination signs are altered accordingly.

171 Mount Dennis Image Archive

	An official TTC map of 171 MOUNT DENNIS operations, effective Sunday, November 23, 2008.
	TTC Orion Bus #1625 runs north on Jane Street, having just turned off of Weston Road, in service on 171 MOUNT DENNIS, in this June 14, 2011 shot. Photo by James Bow.
	TTC Orion VII bus #1625 heads northwest on Weston Road in service on 171 MOUNT DENNIS. This photo was taken on June 14, 2011 by James Bow.
	Orion bus VII 1669 turns onto Weston Road from Eglinton Avenue West reflecting a warm light of evening sun. Photo by Roman Fomin on June 11, 2013.
	A view of the bays at the north end of Mount Dennis garage, as seen from the 171 MOUNT DENNIS bus. This photo was taken on June 14, 2011 by James Bow.