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Trout Brook Storm Sewer Interceptor (TBI) Repairs

Capitol Region Watershed District (CRWD) owns, operates and maintains the Trout Brook Storm Sewer System, a “trunk conveyor” that receives runoff from the cities of Saint Paul, Roseville, Falcon Heights and Maplewood, as well as from Ramsey County and the Minnesota Department of Transportation. A combined sanitary and storm sewer since the 1880s, the systems were separated in 1988. Today, Trout Brook Storm Sewer Interceptor (TBI) carries rainwater and snowmelt from city streets and other hard surfaces to the Mississippi River.

The Challenge

Some sections of the TBI infrastructure is more than 100 years old. CRWD completes entire system inspections on a five-year cycle, minor maintenance and capital repairs of TBI to ensure the system functions properly. When TBI was transferred to CRWD from the Metropolitan Council in 2006, the District repaired two sections of pipe that were in poor condition. The District is in a highly built-up urban environment, and in some cases, TBI repair work has required street closures, utility relocation and railroad realignment.

“TBI drains more than 5,000 acres of the District. Keeping it properly maintained prevents thousands of pounds of sediment and other pollutants from entering the Mississippi River.” – Anna Eleria, Planning, Projects and Grants Division Manager, CRWD

The Solution

CRWD completes regular inspections, maintenance and capital repairs of TBI to ensure the system functions property. Past and present repair work includes:

  • Repairing two sections of pipe that were in poor condition from cracking and settlement beneath the streets
  • Rerouting a section of TBI to avoid conflicts with I-35E bridge construction, which included abandoning a 630-foot section of pipe and replacing it in a new location.
  • Repairing a half-mile stretch of the oldest section of TBI, including repair of a 10×10-foot horseshoe arch, replacement of missing mortar and installing a concrete liner in a 500-foot section of the pipe.

Plans for forthcoming years include regular inspections, general preventative maintenance and long-range planning for major reconstruction projects in the future.

TBI Realignment Project Phase 1 - Fall 2012


Maintenance work keeps TBI functioning efficiently and provides valuable insight on future maintenance priorities for the District and its partners. CRWD collects data from TBI as part of its comprehensive stormwater management program, assessing sediment control, illicit discharge, construction site erosion and pollution. Results of the District’s ongoing measurement programs at TBI can be found in CRWD annual reports.


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