rfb_13199_for_info_only_8-additional_hydraulic_analyses_for_cole_grade_road.pdf

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RFB - COLE GRADE ROAD IMPROVEMENTS PHASE 1
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BPM013199
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This document is a technical report prepared by Chang Consultants for Nasland Engineering regarding additional hydraulic analyses for the Cole Grade Road Crossings project in San Diego County. The report presents HEC-RAS hydraulic modeling results for two proposed channel crossings along Cole Grade Road north and south of Cool Valley Ranch Road. The northerly crossing involves replacing a single 6-foot by 6-foot reinforced concrete box culvert with an 8-foot wide by 6-foot high reinforced concrete box culvert. The southerly crossing entails replacing double 8-foot wide by 10-foot high reinforced concrete box culverts with a 56.8-foot long bridge featuring a 42.3-foot opening perpendicular to the flow direction. The analyses provide velocity and shear stress values at the crossings for 2-, 5-, 10-, 50-, and 100-year storm flow rates, as requested by the San Diego Regional Water Quality Control Board for Clean Water Act Section 401 Certification.

The hydraulic modeling results indicate flow velocities at the proposed bridge ranging from 4.9 to just over 9 feet per second, with velocities of approximately 6 feet per second or greater considered erosive. Flow velocities approaching the culvert are approximately 6 feet per second for all flow rates, with exit velocities ranging from 4.6 to 8.8 feet per second. The analysis concludes that erosion protection is necessary, including bed and bank lining at and near the bridge to prevent erosion and grade control limitations on upstream erosion, as well as riprap installation at the culvert outlet to serve as an energy dissipater and protect against erosion. The total shear stress results from the HEC-RAS output indicate potential for small to moderate erosive forces during various flow events. The design approach prioritized flow velocity methodology over shear stress analysis as the more common erosion protection design approach.

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Chang Civil Engineering◦Hydrology◦Hydraulics◦Sedimentation

P.O. Box 9496 Rancho Santa Fe, CA 92067-4496

T: 858.692.0760 F: 858.832.1402 wayne@changconsultants.com

December 3, 2020

Jarrett Linn Nasland Engineering 4740 Ruffner Street San Diego, CA 92111

Subject: Cole Grade Road Crossings – Additional Hydraulic Analyses

Dear Jarrett:

Chang Consultants prepared the April 28, 2020 report, Hydraulic Analyses for Cole Grade Road Crossings. The report contained 10-, 50-, and 100-year HEC-RAS hydraulic analyses for two proposed channel crossings along Cole Grade Road designed by Nasland Engineering. The crossings are just north and south of Cool Valley Ranch Road. The northerly crossing contains a single 6-foot by 6-foot reinforced concrete box culvert that will be replaced with an 8-foot wide by 6-foot high reinforced concrete box culvert. The southerly crossing contains double 8-foot wide by 10-foot high reinforced concrete box culverts that will be replaced with a 56.8-foot long bridge that crosses the channel at a skew (the opening is 42.3-feet wide perpendicular to the flow direction).

The County of San Diego is processing the project through the San Diego Regional Water Quality Control Board (Board) for a Clean Water Act Section 401 Certification. The Board has requested velocity and shear values at the crossings for the 2-, 5-, 10-, 50-, and 100-year flow rates. The additional HEC-RAS analyses are attached. Table 1 summarizes the flow rates provided by Nasland Engineering. The north (Lateral Creek) and south (Main Creek – Upper Reach) channels confluence just downstream (west) of Cole Grade Road, so the last row in the table contains the combined flow rates below the confluence (Main Creek – Lower Reach). The remaining HEC- RAS input parameters and assumptions are described in the April 2020 report.

Location Flow Rates, cfs

2-Year 5-Year 10-Year 50-Year 100-Year Lateral Creek 167 206 245 318 353

Main Creek – Upper Reach 749 1,367 1,763 2,993 3,373 Main Creek – Lower Reach 916 1,573 2,178 3,496 3,928

Table 1. Summary of Flow Rates

The proposed condition 2-, 5-, 10-, 50-, and 100-year HEC-RAS results and work map are attached along with the flow velocities and shear. The proposed bridge is at cross-section 8.5 in the Upper Reach, while the proposed culvert is at cross-section 103.5 in the Lateral Creek. The flow velocities at the bridge range from 4.9 feet per second to just over 9 fps. Typically, velocities in the range of about 6 fps or greater are considered erosive. Bed and bank lining will be installed in the proposed channel at and near the bridge to prevent erosion. The flow velocities approaching the culvert are approximately 6 fps for all flow rates, while the flow velocities exiting the culvert range from 4.6 to 8.8 fps. Riprap will be installed at the culvert outlet as an energy dissipater and to protect the culvert from erosion associated with headcutting.

The total shear stress is also provided in the HEC-RAS output. For the project, the erosion protection was designed based on the flow velocities, rather than shear stress. The flow velocity approach is a more common methodology.

In summary, the flow velocities and shear stresses indicate a potential for small to moderate erosive forces during various flow events. The channel at and near the proposed bridge will be lined to prevent erosion. The lining will also act as a grade control that limits upstream erosion. The proposed culvert outlet will contain riprap energy dissipation to slow the velocities and prevent undermining of the culvert by erosion. The concrete culvert floor will also act as a grade control that limits upstream erosion.

Sincerely, Wayne W. Chang, M.S., P.E.

Enclosures

HEC-RAS Plan: Prop Cond River Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Shear Total Flow Area Top Width Froude # Chl

(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (lb/sq ft) (sq ft) (ft) Main Creek Upper Reach 203 2-Year 749.0 1424.80 1432.26 1432.43 0.007946 3.28 1.93 228.27 56.46 0.29 Main Creek Upper Reach 203 5-Year 1367.0 1424.80 1434.02 1434.27 0.009263 4.04 2.70 338.09 74.04 0.32 Main Creek Upper Reach 203 10-Year 1763.0 1424.80 1434.71 1435.00 0.009433 4.35 1.94 407.83 151.14 0.40 Main Creek Upper Reach 203 50-Year 2993.0 1424.80 1435.97 1436.40 0.010228 5.31 2.57 572.04 393.95 0.42 Main Creek Upper Reach 203 100-Year 3373.0 1424.80 1436.22 1436.72 0.011089 5.72 1.47 627.04 590.60 0.44

Main Creek Upper Reach 202.9 Lat Struct

Main Creek Upper Reach 202 2-Year 749.0 1424.60 1431.61 1431.84 0.011772 3.90 2.76 192.23 48.96 0.35 Main Creek Upper Reach 202 5-Year 1367.0 1424.60 1433.31 1433.63 0.011936 4.55 2.14 300.14 128.31 0.47 Main Creek Upper Reach 202 10-Year 1763.0 1424.60 1434.06 1434.40 0.010512 4.68 2.11 377.52 322.92 0.43 Main Creek Upper Reach 202 50-Year 2992.6 1424.60 1435.46 1435.84 0.008015 5.13 1.24 635.71 644.18 0.40 Main Creek Upper Reach 202 100-Year 3350.1 1424.60 1435.78 1436.15 0.007294 5.13 1.17 719.46 734.84 0.39

Main Creek Upper Reach 201 2-Year 749.0 1425.00 1428.82 1428.82 1430.12 0.113225 9.14 17.47 81.95 31.84 1.00 Main Creek Upper Reach 201 5-Year 1367.0 1425.00 1430.22 1430.22 1431.90 0.103731 10.40 20.76 131.39 39.15 1.00 Main Creek Upper Reach 201 10-Year 1763.0 1425.00 1430.94 1430.94 1432.80 0.100101 10.96 22.25 160.85 43.09 1.00 Main Creek Upper Reach 201 50-Year 2992.6 1425.00 1432.98 1432.98 1434.63 0.071000 10.31 13.99 290.14 202.28 1.01 Main Creek Upper Reach 201 100-Year 3345.5 1425.00 1433.27 1433.27 1435.01 0.069093 10.59 14.59 315.92 208.07 1.00

Main Creek Upper Reach 199 2-Year 749.0 1421.78 1425.27 1425.84 0.010395 6.27 1.65 126.88 48.70 0.64 Main Creek Upper Reach 199 5-Year 1367.0 1421.78 1426.87 1427.59 0.007481 7.09 1.71 210.63 55.45 0.58 Main Creek Upper Reach 199 10-Year 1763.0 1421.78 1427.76 1428.54 0.006589 7.48 1.74 261.44 59.53 0.56 Main Creek Upper Reach 199 50-Year 2992.6 1421.78 1430.36 1431.21 0.004480 8.00 1.59 433.92 72.90 0.50 Main Creek Upper Reach 199 100-Year 3345.5 1421.78 1431.04 1431.90 0.004113 8.09 1.55 484.48 76.35 0.48

Main Creek Upper Reach 198 2-Year 749.0 1421.54 1425.17 1423.67 1425.54 0.004876 4.89 1.10 153.09 57.96 0.45 Main Creek Upper Reach 198 5-Year 1367.0 1421.54 1426.76 1424.73 1427.35 0.004820 6.20 1.57 220.42 65.28 0.48 Main Creek Upper Reach 198 10-Year 1763.0 1421.54 1427.62 1425.31 1428.35 0.004815 6.86 1.83 256.84 69.21 0.49 Main Creek Upper Reach 198 50-Year 2992.6 1421.54 1429.87 1426.92 1430.99 0.004843 8.50 2.52 352.20 79.48 0.52 Main Creek Upper Reach 198 100-Year 3345.5 1421.54 1430.42 1427.33 1431.65 0.004897 8.91 2.71 375.30 81.95 0.53

Main Creek Upper Reach 8.5 Bridge

Main Creek Upper Reach 8.1 2-Year 749.0 1421.10 1424.73 1425.10 0.004837 4.88 1.10 153.47 55.11 0.45 Main Creek Upper Reach 8.1 5-Year 1367.0 1421.10 1426.30 1426.90 0.004885 6.23 1.58 219.54 60.92 0.48 Main Creek Upper Reach 8.1 10-Year 1763.0 1421.10 1427.14 1427.88 0.004915 6.91 1.85 255.27 64.05 0.50 Main Creek Upper Reach 8.1 50-Year 2992.6 1421.10 1429.35 1430.49 0.005009 8.58 2.58 348.68 71.70 0.53 Main Creek Upper Reach 8.1 100-Year 3345.5 1421.10 1429.88 1431.14 0.005091 9.02 2.79 370.98 72.85 0.54

Main Creek Upper Reach 8 2-Year 749.0 1420.99 1424.67 1425.03 0.004827 4.90 1.00 156.61 47.70 0.45 Main Creek Upper Reach 8 5-Year 1367.0 1420.99 1426.24 1426.81 0.004715 6.15 1.36 229.33 51.20 0.47 Main Creek Upper Reach 8 10-Year 1763.0 1420.99 1427.10 1427.78 0.004658 6.76 1.55 270.04 52.90 0.48 Main Creek Upper Reach 8 50-Year 2992.6 1420.99 1429.35 1430.35 0.004519 8.22 1.98 381.16 57.72 0.50 Main Creek Upper Reach 8 100-Year 3345.5 1420.99 1429.89 1430.98 0.004539 8.59 2.10 408.71 58.88 0.51

HEC-RAS Plan: Prop Cond (Continued) River Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Shear Total Flow Area Top Width Froude # Chl

(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (lb/sq ft) (sq ft) (ft) Main Creek Upper Reach 7.1 2-Year 749.0 1420.93 1423.33 1423.33 1424.51 0.024521 8.88 3.27 87.50 38.27 1.01 Main Creek Upper Reach 7.1 5-Year 1367.0 1420.93 1424.51 1424.51 1426.21 0.021171 10.76 3.99 133.50 40.30 1.00 Main Creek Upper Reach 7.1 10-Year 1763.0 1420.93 1425.16 1425.16 1427.14 0.019896 11.65 4.31 160.03 41.60 1.00 Main Creek Upper Reach 7.1 50-Year 2992.6 1420.93 1426.87 1426.87 1429.60 0.017617 13.77 5.05 234.51 45.13 1.00 Main Creek Upper Reach 7.1 100-Year 3345.5 1420.93 1427.36 1427.36 1430.22 0.016759 14.15 5.00 256.79 47.60 0.98

Main Creek Upper Reach 7 2-Year 749.0 1415.29 1421.98 1422.28 0.001623 4.62 0.45 181.12 36.12 0.33 Main Creek Upper Reach 7 5-Year 1367.0 1415.29 1424.18 1424.65 0.001790 5.93 0.62 266.19 41.30 0.36 Main Creek Upper Reach 7 10-Year 1763.0 1415.29 1425.83 1426.33 0.001533 6.18 0.61 337.46 45.24 0.34 Main Creek Upper Reach 7 50-Year 2992.6 1415.29 1428.01 1428.83 0.002055 8.15 0.81 457.97 67.31 0.41 Main Creek Upper Reach 7 100-Year 3345.5 1415.29 1428.44 1429.36 0.002223 8.68 0.92 485.57 72.01 0.43

Main Creek Lower Reach 6 2-Year 915.4 1415.00 1422.01 1422.04 0.001241 1.52 0.38 602.63 119.84 0.12 Main Creek Lower Reach 6 5-Year 1566.9 1415.00 1424.31 1424.36 0.001177 1.73 0.46 904.23 141.40 0.12 Main Creek Lower Reach 6 10-Year 2162.3 1415.00 1425.99 1426.04 0.001145 1.87 0.51 1154.04 157.02 0.12 Main Creek Lower Reach 6 50-Year 3446.5 1415.00 1428.35 1428.43 0.001273 2.22 0.64 1554.77 187.95 0.13 Main Creek Lower Reach 6 100-Year 3827.0 1415.00 1428.84 1428.92 0.001306 2.33 0.65 1649.71 202.58 0.14

Main Creek Lower Reach 5 2-Year 915.4 1411.31 1421.67 1421.77 0.004509 2.57 1.16 356.46 72.97 0.20 Main Creek Lower Reach 5 5-Year 1566.9 1411.31 1423.97 1424.10 0.004169 2.90 1.37 540.58 86.75 0.20 Main Creek Lower Reach 5 10-Year 2162.3 1411.31 1425.64 1425.79 0.004023 3.11 1.46 696.11 101.95 0.21 Main Creek Lower Reach 5 50-Year 3446.5 1411.31 1427.98 1428.17 0.003684 3.55 0.95 1005.31 225.72 0.21 Main Creek Lower Reach 5 100-Year 3827.0 1411.31 1428.47 1428.66 0.003472 3.57 0.97 1119.33 232.84 0.20

Main Creek Lower Reach 4 2-Year 915.4 1409.80 1420.45 1420.77 0.011772 4.55 3.48 201.15 35.81 0.34 Main Creek Lower Reach 4 5-Year 1566.9 1409.80 1422.63 1423.10 0.013257 5.48 4.75 285.85 41.82 0.37 Main Creek Lower Reach 4 10-Year 2162.3 1409.80 1424.20 1424.77 0.014350 6.09 5.67 354.88 47.08 0.39 Main Creek Lower Reach 4 50-Year 3446.5 1409.80 1426.20 1427.10 0.018441 7.58 8.39 454.56 51.96 0.45 Main Creek Lower Reach 4 100-Year 3827.0 1409.80 1426.62 1427.60 0.019601 7.99 3.86 489.78 144.69 0.47

Main Creek Lower Reach 3 2-Year 915.4 1410.74 1416.45 1417.30 0.044108 7.38 10.02 124.02 30.76 0.65 Main Creek Lower Reach 3 5-Year 1566.9 1410.74 1418.62 1419.59 0.036844 7.91 10.62 198.12 38.37 0.61 Main Creek Lower Reach 3 10-Year 2162.3 1410.74 1420.39 1421.36 0.030412 7.93 9.83 272.72 47.33 0.57 Main Creek Lower Reach 3 50-Year 3446.5 1410.74 1422.75 1423.71 0.022250 7.96 6.53 439.01 87.45 0.51 Main Creek Lower Reach 3 100-Year 3827.0 1410.74 1423.15 1424.15 0.021831 8.07 4.83 480.79 129.62 0.51

Main Creek Lower Reach 2 2-Year 915.4 1408.79 1415.20 1415.31 0.004754 2.74 1.29 334.64 74.81 0.23 Main Creek Lower Reach 2 5-Year 1566.9 1408.79 1417.96 1418.08 0.003211 2.78 1.20 563.64 91.16 0.20 Main Creek Lower Reach 2 10-Year 2162.3 1408.79 1419.92 1420.05 0.002721 2.87 1.20 754.50 103.55 0.19 Main Creek Lower Reach 2 50-Year 3446.5 1408.79 1422.47 1422.62 0.002252 3.15 0.61 1157.08 261.46 0.18 Main Creek Lower Reach 2 100-Year 3827.0 1408.79 1422.92 1423.07 0.002178 3.19 0.61 1279.02 283.63 0.18

Main Creek Lower Reach 1 2-Year 915.4 1404.50 1414.35 1409.35 1414.52 0.005001 3.31 1.74 276.89 44.13 0.23 Main Creek Lower Reach 1 5-Year 1566.9 1404.50 1417.21 1410.78 1417.43 0.005004 3.75 2.11 417.30 54.81 0.24 Main Creek Lower Reach 1 10-Year 2162.3 1404.50 1419.20 1411.84 1419.46 0.005003 4.04 2.36 534.58 62.83 0.24 Main Creek Lower Reach 1 50-Year 3446.5 1404.50 1421.75 1413.70 1422.08 0.005006 4.69 1.48 770.77 154.18 0.25

HEC-RAS Plan: Prop Cond (Continued) River Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Shear Total Flow Area Top Width Froude # Chl

(cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (lb/sq ft) (sq ft) (ft) Main Creek Lower Reach 1 100-Year 3827.0 1404.50 1422.20 1414.19 1422.54 0.005008 4.82 1.40 845.21 179.81 0.26

Lateral Creek Reach-1 203 2-Year 167.0 1434.00 1436.44 1436.55 0.021444 2.61 1.68 63.88 727.65 0.41 Lateral Creek Reach-1 203 5-Year 206.0 1434.00 1436.67 1436.78 0.020757 2.71 1.69 75.99 744.34 0.42 Lateral Creek Reach-1 203 10-Year 245.0 1434.00 1436.83 1435.93 1436.96 0.021258 2.85 1.79 85.98 756.64 0.43 Lateral Creek Reach-1 203 50-Year 318.0 1434.00 1437.06 1436.16 1437.21 0.023023 3.13 2.04 101.60 773.99 0.46 Lateral Creek Reach-1 203 100-Year 353.0 1434.00 1437.16 1436.27 1437.32 0.023617 3.24 2.14 108.79 781.38 0.47

Lateral Creek Reach-1 202.9 Lat Struct

Lateral Creek Reach-1 202 2-Year 166.4 1432.20 1435.22 1435.33 0.019041 2.73 1.77 60.93 573.55 0.39 Lateral Creek Reach-1 202 5-Year 199.9 1432.20 1435.36 1435.50 0.021585 2.98 1.93 67.11 610.86 0.44 Lateral Creek Reach-1 202 10-Year 229.3 1432.20 1435.51 1435.66 0.021923 3.07 1.92 74.62 659.34 0.46 Lateral Creek Reach-1 202 50-Year 276.3 1432.20 1435.80 1435.94 0.019386 3.03 1.70 91.16 738.72 0.45 Lateral Creek Reach-1 202 100-Year 298.1 1432.20 1435.88 1436.03 0.019408 3.08 1.71 96.75 745.79 0.46

Lateral Creek Reach-1 201 2-Year 166.4 1431.30 1434.50 1434.57 0.008813 2.20 0.65 75.80 596.86 0.35 Lateral Creek Reach-1 201 5-Year 199.9 1431.30 1434.80 1434.87 0.005830 2.10 0.53 95.43 620.16 0.30 Lateral Creek Reach-1 201 10-Year 229.3 1431.30 1435.09 1435.16 0.004087 2.02 0.44 114.33 642.20 0.26 Lateral Creek Reach-1 201 50-Year 268.8 1431.30 1435.52 1435.58 0.002569 1.89 0.34 142.85 696.47 0.22 Lateral Creek Reach-1 201 100-Year 282.8 1431.30 1435.62 1435.67 0.002430 1.90 0.33 149.39 699.72 0.22

Lateral Creek Reach-1 200 2-Year 166.4 1429.25 1432.91 1431.62 1433.41 0.061740 5.68 7.36 29.26 179.18 0.52 Lateral Creek Reach-1 200 5-Year 199.9 1429.25 1433.38 1431.93 1433.95 0.064237 6.04 8.15 33.07 183.09 0.52 Lateral Creek Reach-1 200 10-Year 229.3 1429.25 1433.78 1432.19 1434.40 0.066431 6.33 8.81 36.24 186.35 0.52 Lateral Creek Reach-1 200 50-Year 268.8 1429.25 1434.37 1432.51 1434.98 0.099789 6.29 9.66 42.76 222.08 0.72 Lateral Creek Reach-1 200 100-Year 279.5 1429.25 1434.59 1432.60 1435.13 0.099313 5.87 8.71 47.58 247.08 0.74

Lateral Creek Reach-1 103.5 Culvert

Lateral Creek Reach-1 102 2-Year 166.4 1421.30 1423.67 1423.67 1424.87 0.110585 8.78 16.35 18.95 22.52 1.01 Lateral Creek Reach-1 102 5-Year 199.9 1421.30 1424.17 1423.98 1425.35 0.084127 8.70 15.07 22.96 25.05 0.91 Lateral Creek Reach-1 102 10-Year 229.3 1421.30 1426.00 1426.58 0.021422 6.10 6.28 37.59 34.04 0.50 Lateral Creek Reach-1 102 50-Year 268.8 1421.30 1428.45 1428.79 0.007277 4.70 3.25 57.17 43.96 0.31 Lateral Creek Reach-1 102 100-Year 279.5 1421.30 1428.95 1429.27 0.006280 4.57 3.00 61.16 45.55 0.29

Lateral Creek Reach-1 101 2-Year 166.4 1418.00 1422.21 1422.28 0.007638 2.18 1.03 76.42 34.05 0.26 Lateral Creek Reach-1 101 5-Year 199.9 1418.00 1424.53 1424.55 0.001218 1.14 0.25 175.97 52.55 0.11 Lateral Creek Reach-1 101 10-Year 229.3 1418.00 1426.20 1426.21 0.000498 0.83 0.12 276.54 67.79 0.07 Lateral Creek Reach-1 101 50-Year 268.8 1418.00 1428.59 1428.59 0.000169 0.58 0.05 466.36 95.86 0.04 Lateral Creek Reach-1 101 100-Year 279.5 1418.00 1429.08 1429.09 0.000139 0.55 0.04 516.25 105.70 0.04

0 200 400 600 800 1000 1200

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 203

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .1 .04 .018 .04 .1 .04

0 200 400 600 800 1000 1200

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 202

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .1 .04 .018 .04 .1 .04

0 200 400 600 800 1000

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 201

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .1 .04 .018 .04 .1 .04

0 100 200 300 400 500 600 700

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 200

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .018 .04 .1 .04

0 100 200 300 400 500 600 700

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 103.5 Culv

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .018 .04 .1 .04

20 30 40 50 60 70 80 90 100

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 103.5 Culv

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

.04 .1 .04

20 30 40 50 60 70 80 90 100

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 102

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04

0 20 40 60 80 100 120 140 160 180

Cole Grade Road Bridges Plan: Prop Cond River = Lateral Creek Reach = Reach-1 RS = 101

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Bank Sta

.04 .1 .04

0 200 400 600 800 1000 1200

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 203

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

.04 .1 .04 .1 .04 .018 .04 .1 .04

0 200 400 600 800 1000 1200

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 202

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .1 .04 .018 .04 .1 .04

0 200 400 600 800 1000

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 201

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .1 .04 .018 .04 .1 .04

0 20 40 60 80 100

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 199

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

.05 .05 .05

0 20 40 60 80 100

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 198

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.05 .05 .05

0 20 40 60 80 100

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 8.5 BR

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.05 .05 .05

0 20 40 60 80

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 8.5 BR

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

.04 .05 .044

0 20 40 60 80

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 8.1

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .05 .044

0 20 40 60 80 100

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 8

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .075 .04 .05 .044

0 20 40 60 80 100 120

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 7.1

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .

.047 .044

0 20 40 60 80 100 120

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Upper Reach RS = 7

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Ineff

Bank Sta

.04 .075 .04 .044 .044

0 50 100 150 200 250 300

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 6

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Bank Sta

.04 .1 .04

0 50 100 150 200 250 300

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 5

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

0 50 100 150 200 250 300 350

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 4

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Bank Sta

.04 .1 .04

0 50 100 150 200 250 300

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 3

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

Bank Sta

.04 .1 .04

0 100 200 300 400 500

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 2

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

100 200 300 400 500 600

Cole Grade Road Bridges Plan: Prop Cond River = Main Creek Reach = Lower Reach RS = 1

Station (ft)

El ev at io n (ft

Legend

WS 100-Year

WS 50-Year

WS 10-Year

WS 5-Year

WS 2-Year

Ground

File details come from the government source that posted it. Updated .