Table 2. Summary of Key Project Metrics for Setback Levee Alternatives

TABLE 2. SUMMARY OF KEY PROJECT METRICS FOR SETBACK LEVEE ALTERNATIVES

Existing Metric Units Alt. 1 Alt. 2 Alt. 3 Alt. 4 Conditions

Reach River Miles River Miles RM 3.0 - 4.5 RM 3.0 - 4.5 RM 3.0 - 4.5 RM 3.0 - 4.5 RM 3.0 - 3.9 Reach Length River Miles 1.5 1.5 1.5 1.5 0.9

New Levee Overall 1.1, plus Miles 1.43 1.61 1.69 1.84 Length 0.3 stub levee

New Levee Overall Feet 7600 8500 8900 9700 7400 Length Floodwall Length Feet 0 0 500 0 0 Ties into accredited levee or high ground Yes/No No No No No No upstream? Ties into accredited levee or high ground Yes/No No No No No No downstream? Potential Channel Migration Area (area Acres 0.0 60 122 124 43 between existing levee and setback levee) Reconnected Floodplain Area within Acres 0 45 74 70 23 100-year Inundation Area Reconnected Floodplain Area within Acres 0 34 49 46 20 2-year Inundation Area Carbon River Potential Active Channel Width at RM 3.8 Pinch Point Feet 260 540 540 850 380 (assuming right bank side remains fixed)

HABITAT

Side channel created Lineal Feet 0.0 3500 3500 3600 600 Existing Metric Units Alt. 1 Alt. 2 Alt. 3 Alt. 4 Conditions

26 multi-log jams and 583 individual Wood added to active Number key logs 700 750 750 300 channel pieces (Per analysis of 2018 aerial photograph)

Wood added to Number key Not 200 250 250 100 floodplain pieces measured

Wetlands Impacted by Acres 0.0 7 5 5 4 Levee Footprint

Floodplain Riparian and Wetland Acres 0.0 45 61 60 25 Establishment or Enhancement

VOIGHTS CREEK

Voights Creek Reach Length in Same as Reconnected Miles 0.00 0.16 0.57 0.39 existing Floodplain (Setback condition Levee to Existing Levee) Voights Creek Length Same as SR162 to Setback Miles 0.57 0.41 0.0 0.18 existing Levee condition Crossing at New Crossing New Crossing existing at Setback at Setback levee No new Retains Fish passable Levee Levee -- appears to crossing existing crossings replaces replaces meet WDFW required. crossing crossing at crossing at fish passage existing levee. existing levee guidelines.

CARD CREEK Existing Metric Units Alt. 1 Alt. 2 Alt. 3 Alt. 4 Conditions

Ditch through farm Alternatives 1, 2, and 3: Re-locate creek with a fields from southerly alignment along SR 162 to a new SR 162 to confluence with Voights Creek approximately near existing 600 feet downstream of hatchery intake. levee. Near Alternative 2 would have a new fish passage existing opening in the setback levee. For Alternative 2 Retains Card Creek Description levee flow and Alternative 3, the re-located creek would existing splits, with connect to Voights Creek prior to crossing the alignment. some flow to setback levee, thereby avoiding a separate west and setback levee crossing. As an option, Card Creek some flow could be restored along its existing alignment; east to however, a new crossing at the setback levee Voights would be required for Alternatives 1, 2, and 3. Creek. Card Creek Length (NE corner manufacturing facility south of Miles 0.42 0.43 0.43 0.43 0.42 SR162, to Voights Creek)

Re-aligned Card Creek Miles -- 0.00 0.23 0.00 0.00 Length Inside SBL

Card Creek 0.5% 0.5% 0.5% 0.5% N/A Approximate Slope

Currently there are 4 fish barriers Retains Number of Fish Number between 4 4 4 existing Barriers Removed SR162 and condition. the Carbon River 0 (re-located 0 (re-located Card Creek Card Creek joins to New fish joins to Retains Fish Passable Voights Creek passable Voights Creek Number N/A existing Crossing Installed upstream of crossing at upstream of condition. setback levee setback levee. setback levee so no crossing so no crossing is required). is required).

COMMUNITY (FLOOD RISK) Existing Metric Units Alt. 1 Alt. 2 Alt. 3 Alt. 4 Conditions

Stormwater and/or 47 (in new 47 (in new 47 (in new 47 (in new Creek Flow on storm storm storm storm Landward Side of CFS 280 drain/toe drain/toe drain/toe drain/toe Levee at City of Orting trench) trench) trench) trench) limit Moderate reduction for RM 3.0 to 3.5, Moderate most reduction for reduction for $3.3 million RM 3.0 to 3.9. RM 3.6 to 4.0 Moderate (within Moderate Most compared to reduction for Levee Repair $ project reduction for reduction for other RM 3.0 to 3.9. reach, 1990 RM 3.0 to 4.5 RM 4.0 to 4.5 alternatives. No reduction to 2017) compared to Nearly the RM 4.0 to 4.5. other same alternatives. reduction as Alternative 2 for RM 4.0 to 4.5

COMMUNITY (HOMES)

Major Structures (homes, large garages, etc.) Impacted by WSE Number N/A 10 6 5 1 Rise and Levee Footprint

3 homes, RM 4.1-4.3 and landward 4 homes, 4 homes, of setback RM 4.1 to 4.3, RM 4.1 to 4.3, Homes to be acquired Number N/A levee, are shift into the shift into the 0 by County subject to new new increased floodplain floodplain inundation by Voights Creek

COMMUNITY (FOOTHILLS TRAIL)

1.4 including 1.4 including 0.4-mile 0.4-mile 1.0 mile 0.55 mile New Foothills Trail on upstream upstream Miles Varies (replaces 0.9 (replaces Setback Levee connector connector mile) 0.45 mile) (replaces (replaces 0.8 mile) 0.8 mile)

COMMUNITY (AGRICULTURAL LAND) Existing Metric Units Alt. 1 Alt. 2 Alt. 3 Alt. 4 Conditions

Ag land impacted by levee footprint or Acres 0.0 16.8 52.9 60.7 16.7 reconnected to floodplain Ag land shifted to reconnected Acres 0.0 8.8 45.0 51.5 12.3 floodplain (riverward of SBL) Ag land covered by Acres 0.0 8.0 7.9 9.2 4.4 levee footprint Ag land impacted by Card Creek relocation Acres 0.0 4.8 2.6 4.8 0 (assume 100-foot stream corridor)

WDFW HATCHERY ON VOIGHTS CREEK

Estimated change in Feet 0.0 0.6 0.1 0.6 0.0 100-Year flood level

REGULATORY (CARBON RIVER DOWNSTREAM RISE IN WSE)

Predicted 100-year Feet N/A 0.6 to 0.8 0.6 to 0.8 0.6 to 0.8 0.6 to 0.8 WSE Rise at RM 3.0

Predicted 100-year Feet N/A 0.1 to 0.2 0.1 to 0.2 0.1 to 0.2 0.1 to 0.2 WSE Rise at RM 2.6

Predicted 100-year WSE Rise at RM 0.0 Feet N/A 0.0 0.0 0.0 0.0 (confluence with Puyallup River)

Notes: CFS = cubic feet per second SBL = setback levee SR = State Route WSE = water surface elevation WSDOT = Washington State Department of Transportation