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Before and After Project Photos
Headwaters Forest Bridge Installation (Part 1 of 2)
Before: Undersized culvert on the Headwaters Trail, a former logging road in the Headwaters Forest Reserve
During: The stream crossing is excavated to the natural channel grade, with stable sideslopes. Note one concrete abutment
Headwaters Forest Bridge Installation (Part 2 of 2)
After: The bridge has been installed and the bare sideslopes mulched with straw to control erosion
Two years after: Guard rails have been installed for pedestrians. The site is quickly revegetating with willow and groundcover.
Armored Fill Installation (Part 1 of 2)
Before: Undersized, rusted, and perched culvert at this stream crossing has a high potential for failure
A bulldozer is used to dip the crossing fill in preparation for installation of the rock armor
Keyways are dug, lined with fabric and backfilled with large armor at the upstream & downstream end of the crossing's fillslope
Armored Fill Installation (Part 2 of 2)
The remainder of the crossing's fillslope is backfilled with armor of various size classes. Armor size is based on stream power.
After: Armored fill crossing conveying streamflow shortly after completion of construction
Post-winter: Armored fill crossing 6 months following construction, at the end of the first winter
Hollow Tree Creek Bridge Installation
Before: Looking upstream at the perched culvert outlet . The culvert was a barrier to fish migration.
After: Looking upstream at the excavated stream channel and newly installed bridge (top of photo) during peak winter streamflow
Navarro Vineyards Stream Crossing Upgrade and Fish Passage Barrier Removal (1 of 2)
Before: Primary stream crossing culvert is undersized and set too high in the fill, creating a barrier to upstream fish passage.
After: The new culvert is inset into the streambed at the base of fill and is sized to accomodate both fish passag & peak flows
Navarro Vineyards Stream Crossing Upgrade and Fish Passage Barrier Removal (2 of 2)
Before: Stream crossing displays 3 old drainage structures - a small culvert, on a larger culvert, on buried "Humboldt" logs.
During: An excavator is used to remove the old drainage structures and the aggraded sediment upstream of the crossing
After: The new culvert is set at the natural channel gradient and is sized to accomodate both fish passage and peak flows
Stream Crossing Culvert Upgrade - Flared Inlet
Before: This culvert is slightly undersized and prone to plugging from debris during high flow events
After: A flared inlet paired with a single post trash rack increases effective culvert capacity and decreases plug potential.
Stream Crossing Upgrade - Overflow Pipe Installation
Before: This "new" stream crossing culvert was undersized and prone to plugging and overtopping during high flows.
After: An emergency overflow culvert was installed to prevent overtopping when the primary culvert capacity is exceeded
Lacks Creek Stream Crossing Culvert Upgrade (Looking Upstream)(1 of 2)
Before: This culvert was undersized and set too high in the fill prism, causing scour below the outlet
After: A properly sized culvert is installed at the natural channel grade, minimizing the volume of fill in the crossing
