Fish Passage Case Studies
All Crossings

Case Studies .: About .:. Evaluate

Bridge with step-pool channel for grade control

Culvert Retrofit, Corner Baffle Retrofit, Hydraulic Design

Stream simulation at 4% slope with bed retention sills

Stream simulation of steep (7.7%) step-pool channel using bed retention sills

Stream Simulation Bottomless Arch Culvert

Cheese Creek Embedded Squash Pipe

Bottomless Arch Culvert w/Concrete Footings, Stream Simulation Design

Low-water crossing with added low-flow culvert

Bottomless Arch Culvert, Roughened Rock Channel

Low-Water Crossing with Concrete Planks Buttressed by Concrete Median Barriers and Rock Weir

Low-Water Crossing Using Stone Filled Geocells

Culvert Retrofit with Corner Baffles, Downstream Channel Regrade with Concrete and Rock Weirs to raise tailwater.

Stream Simulation Bottomless Arch Culvert with Step-Pool Reaches to Control Channel Profile

Roughened channel with prefabricated bridge to provide passage over dam and preserve impounded wetland

Culvert Rehabilitation with Metal Insert, Corner Baffle Retrofit, Hydraulic Design, Placement of Concrete Weirs

Hybrid Pool and Weir Fishway with Concrete Pools and Removable Wood Baffles, Hydraulic Design

Open Bottom Arch with Stream Simulation Channel Bed and Banks

Stream Simulation, submersible bridge with collapsible railings

Embedded Circular Culvert

Vented ford using three embedded box culverts sized to match bankfull width and depth.

Concrete Bottomless Arch Culvert with Regraded Channel and Sediment Removal, Stream Simulation Design

Arch culvert with simulated steep boulder channel anticipated to form step-pools

Embedded pipe-arch culvert with downstream boulder grade control

Concrete pool and vortex weir fishway, partially covered by metal arch culvert.

Grouted rock step pools below outlet, Retrofit box culvert with offset baffles

Pre-Cast Concrete Bridge with Boulder Steps on Steep Stream

Vented Ford Using Three Box Culverts Sized to Match Bankfull Width and Depth

Side-hinged tidegate with auxiliary door to create upstream muted tide

Concrete Fishway and Rock Grade Control

Complete removal of the road-stream crossing and reconstructing of the stream channel

Culvert extension for highway widening, addition of concrete weirs, and construction of grouted roughened channel below outlet apron

Reconstruction of incised channel to eliminate perched bridge apron

Constructing small step-pools into rock & concrete bridge apron

Retrofit with pool-and-weir fish ladder around grade control structure at bridge crossing

Stream Simulation, bottomless arch, undermined footing retrofit with concrete weir-struts

Stream Simulation, Open Bottom Concrete Arch

Boulders randomly placed below culvert to raise channel grade and eliminate a perched outlet

Metal Box Culvert with Concrete Fishway and Rock Grade Control

Removal of flashboard dam, requiring addition of boulder weirs below upstream culvert

Open bottom arch culvert with stream simulation channel bed. Construction included excavation of a deep fill which limited equipment access, requiring use of a crane and concrete pump truck.

Culvert embedded and channel regraded with boulder weirs that failed during first year

Concrete Bottomless Arch Culvert with Grade Control

Bridge Built with Precast Pre-stressed Concrete Beams

Stream Simulation with Modular Bridge

Stream Simulation, Bottomless Arch Culvert

Box culvert retrofit with angle baffles and 3 downstream rock weirs

Bottomless Arch Culvert w/ Concrete Footings, Stream Simulation

Culvert Retrofit, Offset Baffle Retrofit, Hydraulic Design