CTA Reroutes South Side Buses for Construction

CTA reroutes buses 4 and 115 northbound via King Drive for Cottage Grove construction

CTA Reroutes Bus Routes 4, 115 for Construction

Chicago's CTA will detour two South Side bus routes starting Tuesday morning due to construction work on Cottage Grove. Routes #4 Cottage Grove and #115 Pullman/115th will see northbound service rerouted via King Drive and 107th Street, transit officials said. The service change takes effect April 7 at 6 a.m., though officials haven't announced when the detour will end.

Construction Prompts Service Adjustment

The reroute's necessary to accommodate construction work on Cottage Grove between 107th and 111th streets, according to the transit agency. Southbound buses on both routes will continue operating normally without changes. Officials said the work requires temporarily closing portions of the street to through traffic, making the northbound detour necessary. The CTA didn't provide details about the construction project's scope or which agency is performing the work.

Detour Route and Affected Service

Northbound buses will leave their regular route on Cottage Grove, travel via King Drive, then turn at 107th Street before resuming normal service on Cottage Grove north of the construction zone. The detour affects only northbound service on routes #4 and #115, which serve communities on Chicago's South Side. Officials advised passengers to allow extra travel time when using these routes during the detour period. Specific details about how much additional time riders should expect weren't provided by the agency.

Timeline Remains Open-Ended

The service change begins Tuesday, April 7, 2026, at 6 a.m., but officials haven't determined when the temporary reroute will end. The CTA typically ties service detours to construction timelines, which can shift based on weather, project complications, or contractor schedules. The agency said it'll announce the detour's end date once construction completion becomes clearer.

System-Wide Service Updates Available

Riders on routes #4 and #115 should expect minor delays and different stop locations during the detour period. The changes affect multiple bus stops along the construction zone, though officials didn't specify which stops will be temporarily relocated or bypassed. Moovit provides real-time updates for CTA routes, helping riders track buses and plan trips around service changes throughout Chicago's transit system.