by Dr. Robert J. Houghtalen, P.E.

RANDOM INSPECTION OF RANDOM INSPECTION OF PIPE ARCH CULVERTS IN PIPE ARCH CULVERTS IN

CRAWFORD COUNTYCRAWFORD COUNTY(7/24/02)(7/24/02)

FAILED CULVERT FAILED CULVERT (Large CMP Arch)(Large CMP Arch)

The failed culvert was replaced by a 15.5 ft. The failed culvert was replaced by a 15.5 ft.

round, CMP w/headwalls and wingwalls.round, CMP w/headwalls and wingwalls.

Assorted pictures of Assorted pictures of the new culvert. the new culvert.

Picture inside looking Picture inside looking downstreamdownstream

Relative size of culvert.Relative size of culvert. Downstream headwall Downstream headwall

and wingwalls.and wingwalls.

PURPOSE AND EXTENT PURPOSE AND EXTENT OF INSPECTION OF INSPECTION

Purpose – The inspection was initiated to gain insight into the pipe arch culvert failure of August 7, 2000 in Crawford County that caused 3 deaths.

Extent – Three pipe arch culverts were chosen at random on county road 1150E just north of Robinson.

Location of Inspected CulvertsLocation of Inspected Culverts

Inspected Culverts are CMP ArchesInspected Culverts are CMP Arches

Southern Culvert

Northern Culvert

Middle Culvert

Upstream side Upstream side of culvert. of culvert.

Note the scour Note the scour hole on the hole on the

south side and south side and the debris the debris build-up. build-up.

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH

Inside the Inside the entrance of the entrance of the culvert. Note culvert. Note the abrasion the abrasion holes, loss of holes, loss of annealing?, annealing?, and rust. and rust.

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH

Upstream side Upstream side of culvert on of culvert on

the north side. the north side. Riprap has Riprap has

been dumped been dumped into a scour into a scour

hole. hole.

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH

The entrance The entrance lip of the lip of the

culvert. The lip culvert. The lip is being is being

undermined undermined and corrosion and corrosion

is present. is present.

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH

Outlet side of Outlet side of culvert. Size: culvert. Size: 11.5’ wide by 11.5’ wide by

7.5’ high. Note 7.5’ high. Note the rock the rock

reinforcement reinforcement of the southern of the southern

culvert culvert sidewall. sidewall.

Close-up of Close-up of the rock the rock

reinforcement. reinforcement. This has This has

obviously been obviously been placed to help placed to help

prevent prevent culvert culvert

collapse. collapse.

THE SOUTHERN CMP ARCHTHE SOUTHERN CMP ARCH